Feature · From measurement to consistency

Use your smartwatch’s VO₂Max to build an exercise habit

Let the number be a prompt to review your current exercise habits. This guide covers finding the value, moving at a manageable level, and reviewing how to keep going.

STEP 1

Find the value

Choose your product to find where the value appears, the conditions needed, and the manufacturer’s instructions.

Compatible models and exercise requirements vary by product. Even if no value appears yet, you can start by choosing exercise that suits you.

A smartwatch’s VO₂Max is an estimate, not a diagnosis. Individual errors occur, and small changes alone cannot establish a change in fitness. Read about accuracy and limitations

STEP 2

Record the conditions alongside the number

When the value updates, check its measurement date in the app and the circumstances at that time. These items can help you review the conditions when comparing entries in your own notes.

Example record

Keep the value and conditions in one note

VO₂Max record

Measurement date: Example space for the measurement date shown in the app
Displayed value: mL/kg/min
Device and estimation method: Smartwatch model / activity type
How you felt that day: Fatigue / anything unusual
Exercise conditions: Outdoors or indoors / flat or hilly / heat

Check the measurement date

The day you view the screen may differ from the day the value was measured. Check the date and units recorded in the app.

Compare the conditions with your previous entry

Check whether the device, activity, health, and environment were similar. Estimation errors remain even under comparable conditions.

This is a template to copy into your own notes, not an actual measurement record. Review how you felt and the conditions alongside changes in the number.

You do not need to enter anything on this page. If your method or device changes, review those differences rather than directly comparing the numbers. Matching conditions does not remove estimation error.

STEP 3

Choose exercise that fits your current routine

Japan’s Ministry of Health, Labour and Welfare recommends regular aerobic exercise to maintain and improve cardiorespiratory fitness. Choose your starting point based on recent activity and how you feel, not the displayed number alone.

I have not exercised much lately

Start with short periods of light activity. Move a little more than you do now and find a manageable way to begin.

Find your starting point

I already walk regularly and want some variety

Learn about alternating brisk and slower walking, the conditions used in research, and precautions for adapting exercise to your fitness.

Explore interval walking →

I go to a gym or work with a personal trainer

Consider how to include endurance work in your routine. Find aerobic exercise options and example questions you can take to your trainer.

Use your usual gym →

I am interested in HIIT

First review medical conditions, medication, symptoms, and recent activity. If you are not used to exercise, build up gradually from light activity.

Check how to start safely first →

Then read: HIIT research and its conditions

If you have a medical condition or take medication, consult your doctor before starting exercise. The heart rate guidance on this site does not apply to people taking medication that lowers heart rate.

STEP 4

Choose your next opportunity to move

Think about where your chosen activity could fit into daily life. Decide on one plan for when, where, and what you will do, then record what you actually completed in your notes or an app you already use.

If plans change, choose the next opportunity to try.
Review the activity and time completed, along with effort and fatigue.
If fatigue persists, reduce the amount or rest.

You do not need to push yourself just to update a VO₂Max display. Stop exercising and consult a doctor if you have chest pain, dizziness, or similar symptoms. Check when to stop and how to assess your condition

STEP 5

Review the number and your routine

When reviewing your records, consider these questions alongside changes in VO₂Max:

Was the routine manageable in daily life?
Is fatigue lingering, or does the amount of exercise need adjusting?
Were the values obtained with the same device and method under similar conditions?

An unchanged value alone is not a reason to increase exercise. If it falls, also check estimation conditions and changes in how you feel, then choose activity you can sustain.

Average effects in studies do not promise your own result or a change in your smartwatch’s display. Make continuing suitable activity your next step.

Find a manageable way to start

Sources

Japan's Ministry of Health, Labour and Welfare: Physical Activity and Exercise Guide for Health Promotion 2023, INFORMATION 6, Cardiorespiratory fitness (peak oxygen uptake). (in Japanese; title translated) https://www.mhlw.go.jp/content/001195874.pdf
Japan's Ministry of Health, Labour and Welfare: Physical Activity and Exercise Guide for Health Promotion 2023, INFORMATION 4, Points for safe physical activity and exercise. (in Japanese; title translated) https://www.mhlw.go.jp/content/001195872.pdf
Molina-Garcia P, et al. Validity of Estimating the Maximal Oxygen Consumption by Consumer Wearables: A Systematic Review with Meta-analysis and Expert Statement of the INTERLIVE Network. Sports Med. 2022;52:1577-1597. https://doi.org/10.1007/s40279-021-01639-y
Apple Support: Track your cardio fitness levels (published 16 September 2026). (in Japanese; title translated) https://support.apple.com/ja-jp/108790
Garmin Support: Frequently asked questions about the Garmin Connect app. (in Japanese; title translated) https://support.garmin.com/ja-JP/?faq=N7qM9eVuzl77PNYKV8ORX5
Google Health Help: About VO₂Max. (in Japanese; title translated) https://support.google.com/googlehealth/answer/14237924?hl=ja
Samsung US Support "Work out with your Wear OS Galaxy Watch" https://www.samsung.com/us/support/answer/ANS10003401/

No specialist review; sources providedContent last checked: October 24, 2026Editorial policy