When you exercise, how often do you work hard enough to become clearly breathless and feel a substantial cardiovascular effort?

I rarely exercise at all — and when I do, I don’t push hard enough to feel breathless

Occasionally — a few times a month

About half my sessions include a vigorous effort

Most sessions include vigorous-intensity work

When you're deep in focused work, what actually gets you up out of your chair?

I trust my body to tell me when it's time to move — I don't need a system for it

I have a rough habit of standing occasionally, but there's no fixed pattern to it

I mostly follow a rule of thumb — up every couple of hours or so — though I don't track it precisely

I have a recurring alarm that gets me up on a fixed interval, whatever I'm doing

Compared to three months ago, how would you describe the trend in your aerobic fitness and physical capacity?

Declining, or I have not exercised regularly enough to track any trend

Clearly improving — I can do more than I could before

In the first hour after waking, how refreshed and alert do you genuinely feel?

Exhausted — I need caffeine just to function

Noticeably groggy for several hours

Mostly alert within an hour, with a short sluggish period

Genuinely alert and ready within about 30 minutes

Which best describes your honest approach to bedtime and wake time across the week?

I keep it flexible — I don't want to be ruled by a fixed bedtime, so it shifts with how the day goes

It shifts fairly often from night to night, without much of a pattern

Mostly steady, but weekends pull it an hour or two later

Bedtime and wake time stay within about 30 minutes of each other, every day including weekends

How often do you rely on sleeping substantially longer at weekends to feel caught up?

I sleep as much as possible at weekends and still feel behind

I need significantly more sleep at weekends (2 or more hours)

A little extra — about an hour more

Rarely — I need no or minimal extra sleep at weekends

After a particularly demanding day, how well do you recover your mental energy by the following morning?

Rarely — fatigue accumulates across the week

I often carry tiredness forward into the next day

Usually reasonably recovered, with the odd poor morning

I consistently feel restored and ready the next day

When you're off the clock, what's your honest relationship with staying reachable?

I stay reachable and check in throughout my downtime — that level of availability is just part of how I show up

Boundaries are blurred — I'm often semi-working during what's meant to be downtime

Mostly clear, but I check in occasionally during rest time

When I'm off, I'm genuinely off — obligations wait until I'm back

How often do you feel mentally foggy, unable to concentrate, or unable to think clearly?

Most days — fog is my normal state

Several times a week — it significantly affects my output

Occasionally, especially later in demanding periods

Rarely — my thinking is mostly clear and sharp

How do you typically approach days when you are not doing structured exercise?

Almost entirely sedentary — sitting or resting all day

Largely sedentary with minimal movement

Mostly quiet but with some light activity

Actively moving — walking, light tasks throughout the day

After a hard physical effort, how long does it typically take before you feel fully ready for the next challenge?

I rarely feel fully recovered before the next effort

Longer than 72 hours, or I often feel not quite recovered

The day after a hard training session, which best matches how you actually operate?

I don’t currently have hard training days — or when one happens, the next day is completely sedentary

Rarely — post-training days are usually fully sedentary

Often, but not consistently — some post-effort days include gentle movement, some don't

Almost always — I build a gentle walk or light movement into the day after a hard session

How close to your usual bedtime do you typically eat your last substantial meal or snack?

I often eat right up to or after getting into bed

Which best describes how you actually handle the gap between your first and last calorie of the day?

I eat intuitively whenever I'm hungry — watching a clock for meals feels unnecessarily restrictive

I don't track it, but my meals are probably spread across most of the day

I keep a rough sense of a window, somewhere in the 10 to 14 hour range

I deliberately keep my eating window under 10 hours

How often do you eat your largest or most substantial meal in the late evening (after 7 pm)?

Most evenings — dinner is my largest meal and it is late

Often — several evenings a week

Occasionally — once or twice a week

Almost never — my largest meals are earlier in the day

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Where Are Your Energy Weak Points Hiding?

Your Fatigue & Energy Profile

Where Are Your Energy Weak Points Hiding?

A 20-scenario self-report that groups your selected answer points across five editorial dimensions. It is not a validated measure of an underlying trait.

20 scenarios5 groups4 forced choicesno neutral option

Topic context from the cited source; it does not validate this questionnaire or its score thresholds.

— Puetz, Flowers & O'Connor (2008)

What your answers coverMitochondrial Lifestyle HabitsHow much regular vigorous exercise you get versus time spent sitting still.Sleep Quality ContributionHow much restorative sleep you get and how consistent your sleep schedule is.Stress Load BurdenHow heavy your day-to-day stress load is and how well you recover from it.Movement and Recovery FrequencyHow often you move your body and let it properly recover afterwards.Nutrition TimingHow consistently timed your meals are, especially eating close to bedtime.

Fatigue & Energy Assessment: Find Your Metabolic Performance Leaks

Twenty forced-choice scenarios are summed into editorial answer-score bands; the result does not diagnose or measure an underlying trait.

~8-10 min · Item answers and results stay on this device · Share links and invite cards carry no scores

Answer for how your energy has actually behaved lately, not how it should look after the next fix you're planning.

A structured self-reflection — not a diagnostic.

This assessment is a structured self-reflection tool and educational resource — it is not a validated diagnostic and is not a substitute for clinical evaluation. Every dimension insight references peer-reviewed literature for educational context only. If you have concerns about your health, consult a qualified professional. Self-report instruments of this kind have no validated retest interval; the four-to-six-week Second Reading is a sensible practice, not a clinical standard.

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Fatigue & Energy Assessment: Find Your Metabolic Performance Leaks

This literature-informed structured self-reflection adds up what you select about exercise habits, sleep recovery, stress load, daily movement, and meal timing. It cannot describe fatigue, anaemia, a thyroid condition, or measure your metabolic rate or mitochondrial function.

Interactive scoring requires JavaScript. You can still read every question and answer option below.

How many sessions of aerobic exercise lasting at least 20 minutes do you complete in a typical week?
- Rarely or never
- Once a week
- Twice or three times a week
- Four or more times a week
When you exercise, how often do you work hard enough to become clearly breathless and feel a substantial cardiovascular effort?
- I rarely exercise at all — and when I do, I don’t push hard enough to feel breathless
- Occasionally — a few times a month
- About half my sessions include a vigorous effort
- Most sessions include vigorous-intensity work
When you're deep in focused work, what actually gets you up out of your chair?
- I trust my body to tell me when it's time to move — I don't need a system for it
- I have a rough habit of standing occasionally, but there's no fixed pattern to it
- I mostly follow a rule of thumb — up every couple of hours or so — though I don't track it precisely
- I have a recurring alarm that gets me up on a fixed interval, whatever I'm doing
Compared to three months ago, how would you describe the trend in your aerobic fitness and physical capacity?
- Declining, or I have not exercised regularly enough to track any trend
- Slightly declining
- Roughly stable
- Clearly improving — I can do more than I could before
On a typical weeknight, how many hours of actual sleep do you get?
- Under 5 hours, or it varies so wildly I cannot say
- About 5 to 6 hours
- About 6 to 7 hours
- 7 to 9 hours
In the first hour after waking, how refreshed and alert do you genuinely feel?
- Exhausted — I need caffeine just to function
- Noticeably groggy for several hours
- Mostly alert within an hour, with a short sluggish period
- Genuinely alert and ready within about 30 minutes
Which best describes your honest approach to bedtime and wake time across the week?
- I keep it flexible — I don't want to be ruled by a fixed bedtime, so it shifts with how the day goes
- It shifts fairly often from night to night, without much of a pattern
- Mostly steady, but weekends pull it an hour or two later
- Bedtime and wake time stay within about 30 minutes of each other, every day including weekends
How often do you rely on sleeping substantially longer at weekends to feel caught up?
- I sleep as much as possible at weekends and still feel behind
- I need significantly more sleep at weekends (2 or more hours)
- A little extra — about an hour more
- Rarely — I need no or minimal extra sleep at weekends
How would you describe your overall stress load across a typical week?
- Overwhelming — I am almost always near my limit
- High and sustained — I rarely decompress properly
- Moderately high — I am often stretched but manage
- Manageable — demanding at times but I recover well
After a particularly demanding day, how well do you recover your mental energy by the following morning?
- Rarely — fatigue accumulates across the week
- I often carry tiredness forward into the next day
- Usually reasonably recovered, with the odd poor morning
- I consistently feel restored and ready the next day
When you're off the clock, what's your honest relationship with staying reachable?
- I stay reachable and check in throughout my downtime — that level of availability is just part of how I show up
- Boundaries are blurred — I'm often semi-working during what's meant to be downtime
- Mostly clear, but I check in occasionally during rest time
- When I'm off, I'm genuinely off — obligations wait until I'm back
How often do you feel mentally foggy, unable to concentrate, or unable to think clearly?
- Most days — fog is my normal state
- Several times a week — it significantly affects my output
- Occasionally, especially later in demanding periods
- Rarely — my thinking is mostly clear and sharp
Over a typical week, how many days include at least 30 minutes of deliberate physical activity at any intensity?
- Rarely or never
- 1 to 2 days
- 3 to 4 days
- 5 or more days
How do you typically approach days when you are not doing structured exercise?
- Almost entirely sedentary — sitting or resting all day
- Largely sedentary with minimal movement
- Mostly quiet but with some light activity
- Actively moving — walking, light tasks throughout the day
After a hard physical effort, how long does it typically take before you feel fully ready for the next challenge?
- I rarely feel fully recovered before the next effort
- Longer than 72 hours, or I often feel not quite recovered
- About 48 to 72 hours
- Usually within 24 to 48 hours
The day after a hard training session, which best matches how you actually operate?
- I don’t currently have hard training days — or when one happens, the next day is completely sedentary
- Rarely — post-training days are usually fully sedentary
- Often, but not consistently — some post-effort days include gentle movement, some don't
- Almost always — I build a gentle walk or light movement into the day after a hard session
How consistent is the time of your first meal of the day across weekdays?
- Highly variable or I often skip the first meal entirely
- Quite variable — an hour or more of variation across days
- Within about an hour of the same time
- Within 30 minutes of the same time every day
How close to your usual bedtime do you typically eat your last substantial meal or snack?
- I often eat right up to or after getting into bed
- Within about an hour of sleep
- About 2 hours before sleep
- At least 3 hours before sleep
Which best describes how you actually handle the gap between your first and last calorie of the day?
- I eat intuitively whenever I'm hungry — watching a clock for meals feels unnecessarily restrictive
- I don't track it, but my meals are probably spread across most of the day
- I keep a rough sense of a window, somewhere in the 10 to 14 hour range
- I deliberately keep my eating window under 10 hours
How often do you eat your largest or most substantial meal in the late evening (after 7 pm)?
- Most evenings — dinner is my largest meal and it is late
- Often — several evenings a week
- Occasionally — once or twice a week
- Almost never — my largest meals are earlier in the day

Appendix · Method & evidence Bio · Case file

How this instrument works

This is a 20-item structured self-assessment of your energy weak points, read across 5 dimensions: Mitochondrial Lifestyle Habits; Sleep Quality Contribution; Stress Load Burden; Movement and Recovery Frequency; and Nutrition Timing. Each item is a concrete scenario with four forced-choice responses — no neutral midpoint, so every answer commits to a direction — and response order is shuffled on every run to vary position; this implementation has not been tested for bias reduction. 5 of the 20 items are reverse-keyed — the attractive-sounding response is the structurally weak one — with wording intended to challenge socially desirable framing; this design has not been tested for bias reduction.

Scoring combines an overall reading with a per-dimension profile. Cascade flags compare configured dimension totals with editorial thresholds. They do not establish a compound risk and may not reflect the item-level pattern. The result bands are editorial guidance, not clinical thresholds: they organise the reading, they do not describe.

Every dimension insight cites peer-reviewed literature, and most answer reveals do — 6 sources back this instrument, each with DOI metadata supplied at build time; source relevance and claim interpretation remain editorial judgments. Compiled by the High Performance Culture editorial team. Instrument v1.1 · August 2026.

Read the full assessment methodology →

Items: 20
Dimensions: 5
Format: Forced choice, 4 options
Sources: 6
Instrument: v1.1 · August 2026

The 5 editorial answer groups

Mitochondrial Lifestyle Habits

Strength here looks like completing four or more aerobic sessions a week with vigorous-intensity efforts, while breaking up sitting throughout the day — sustaining the primary physiological stimulus for skeletal muscle mitochondrial maintenance.

The vulnerable pattern: infrequent or low-intensity exercise and long unbroken sitting periods remove the stimulus that drives mitochondrial adaptation in skeletal muscle, progressively reducing oxidative capacity.

Sample itemHow many sessions of aerobic exercise lasting at least 20 minutes do you complete in a typical week?

First structural move: Schedule three aerobic sessions this week — put specific times in your calendar. The habit becomes real when it has a slot and a duration.

Go deeperProtocol: The Energy Systems Protocol →Glossary: Mitochondria →

Sleep Quality Contribution

Strength here looks like sleeping 7–9 hours on a consistent schedule and waking genuinely refreshed, with no reliance on weekend catch-up — the functional signal that overnight neurobehavioral recovery is keeping up with daily demand.

The vulnerable pattern: restricting sleep below 7 hours or varying the schedule widely so that cumulative neurobehavioral deficits build across the week, understated by self-reported sleepiness.

Sample itemOn a typical weeknight, how many hours of actual sleep do you get?

First structural move: Set a fixed lights-out time 7.5 hours before your wake alarm and hold it every day this week — protecting the sleep opportunity is the prerequisite for adequate recovery.

Go deeperProtocol: The Sleep Optimisation Protocol →Glossary: Sleep debt →Glossary: Social jet lag →

Stress Load Burden

Strength here looks like sustaining a demand-recovery balance where the stress response activates appropriately and returns to baseline between stressors — the adaptive, physiologically healthy stress profile.

The vulnerable pattern: prolonged high-load periods without genuine recovery intervals sustain HPA and sympathetic activation, progressively impairing metabolic, immune, and cognitive function.

Sample itemHow would you describe your overall stress load across a typical week?

First structural move: Claim one recovery cue you can defend even on a packed day — a few genuinely uninterrupted minutes with your phone in another room, or a slow walk between two obligations. What matters is a real pause you control, not how long it lasts; protect that, then extend it when the day allows.

Go deeperDeep dive: The Science of Cortisol →Glossary: HPA axis →

Movement and Recovery Frequency

Strength here looks like meeting or exceeding the physical activity guidelines with five or more active days, integrating light movement on rest days and recovering well within 48 hours of hard efforts.

The vulnerable pattern: infrequent activity and sedentary recovery days compound the inactive-behaviour burden that the physical activity guidelines identify as a major modifiable risk factor, independent of structured exercise.

Sample itemOver a typical week, how many days include at least 30 minutes of deliberate physical activity at any intensity?

First structural move: Count your active days this week, then choose one specific time slot to add one more — put it in your calendar as a non-negotiable.

Go deeperGlossary: VO2 max →Glossary: Hormesis →

Nutrition Timing

Strength here looks like eating within a consistent, compressed window anchored early in the day, with the last meal at least three hours before sleep — aligning intake with the circadian pattern that time-restricted feeding research associates with better metabolic markers.

The vulnerable pattern: a wide eating window extending into the late evening compresses the overnight fast, places caloric load during the period of lowest metabolic tolerance, and disrupts the consistency that timing research supports.

Sample itemHow consistent is the time of your first meal of the day across weekdays?

First structural move: Track the actual time of your first and last calorie for three days — most people find their window is longer than they assumed, which makes narrowing it more straightforward.

Go deeperProtocol: The Metabolic Reset Protocol →Deep dive: How Your Circadian Clock Works →Glossary: Time-restricted eating →

Questions, answered

Is this a diagnosis?

No. This assessment is a structured self-reflection tool, not a validated clinical instrument. Its result bands are editorial guidance, not clinical thresholds — they organise your answers into a readable profile; they do not describe a condition. If you have concerns about your health or wellbeing, speak to a qualified professional.

How were the questions designed?

Each of the 20 items presents a concrete scenario with four graded responses and no neutral midpoint, so every answer commits to a lean. Items were authored against the peer-reviewed literature listed in the evidence file on this page, and citation metadata is supplied at build time; source relevance and claim interpretation remain editorial judgments. Response order is shuffled on every run to vary position; this implementation has not been tested for bias reduction.

What happens to my answers?

Assessment answers stay on this device. Unfinished progress expires after 30 days. A completed profile and optional comparison history remain until you delete local assessment data or clear browser data. If you opt into email, your email address is sent; item answers are not. If you share a result link, total and dimension scores are included in the URL and may appear in browser, server, CDN, or analytics logs.

How often should I retake it?

The instrument keeps your previous reading and sets the two side by side when you retake — the Second Reading. There is no validated retest interval; repeat only if a raw answer-point comparison would be useful, and do not treat it as confirmed underlying change.

Why bands instead of percentiles?

Because this assessment does not collect a population score set, there is no reader population to rank you against — and we will not invent one. The 5-dimension profile groups selected answer points for editorial display; it is not a validated structural or decision-utility model.

Where does the evidence come from?

Every dimension insight cites peer-reviewed research, and most answer reveals do — 6 sources stand behind this instrument, each with DOI metadata supplied at build time; source relevance and claim interpretation remain editorial judgments. A few reveals are straightforward editorial reasoning from the same evidence base and carry no citation by design. The full list, with DOIs, is in the evidence file below.

The evidence file

6 peer-reviewed sources stand behind this instrument's items and insights.

Hood et al. (2019) — Maintenance of Skeletal Muscle Mitochondria in Health, Exercise, and Aging. Annual Review of Physiology. DOI: 10.1146/annurev-physiol-020518-114310 ✓ Crossref‑verified
Van Dongen et al. (2003) — The Cumulative Cost of Additional Wakefulness: Dose-Response Effects on Neurobehavioral Functions and Sleep Physiology From Chronic Sleep Restriction and Total Sleep Deprivation. Sleep. DOI: 10.1093/sleep/26.2.117 ✓ Crossref‑verified
Chrousos (2009) — Stress and disorders of the stress system. Nature Reviews Endocrinology. DOI: 10.1038/nrendo.2009.106 ✓ Crossref‑verified
Sutton et al. (2018) — Early Time-Restricted Feeding Improves Insulin Sensitivity, Blood Pressure, and Oxidative Stress Even without Weight Loss in Men with Prediabetes. Cell Metabolism. DOI: 10.1016/j.cmet.2018.04.010 ✓ Crossref‑verified
Piercy et al. (2018) — The Physical Activity Guidelines for Americans. JAMA. DOI: 10.1001/jama.2018.14854 ✓ Crossref‑verified
Puetz, Flowers & O'Connor (2008) — A Randomized Controlled Trial of the Effect of Aerobic Exercise Training on Feelings of Energy and Fatigue in Sedentary Young Adults with Persistent Fatigue. Psychotherapy and Psychosomatics. DOI: 10.1159/000116610 ✓ Crossref‑verified

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Where Are Your Energy Weak Points Hiding?

Where Are Your Energy Weak Points Hiding?

Fatigue & Energy Assessment: Find Your Metabolic Performance Leaks

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