Athlete OS

Train to your real numbers, not your watch's guesses.

A dashboard for runners, cyclists, swimmers, triathletes and Hyrox athletes. It turns lab-tested VO₂ max, thresholds, metabolic rate and body composition into your training zones and fueling targets.

Free to start · Made by Box Nutrition & Performance, Birmingham

Watches guess

Default heart-rate zones come from a formula like 220 minus your age. It can be wrong by a lot, and every session gets judged against it.

Plans are generic

A plan built on a guessed threshold and a guessed calorie target is a guess on top of a guess.

Test results sit in a PDF

A lab test is only useful if it changes what you do next week. Your numbers should live where you train.

What you get

Your test results, turned into a training tool.

Measured zones

Heart-rate zones set from your ventilatory and lactate thresholds, with pace, power or swim targets for your sport.

Fueling targets

Daily calorie baseline from your measured RMR, protein from lean mass, and carbs per hour for long sessions.

A trust label on every number

Lab measured, field tested or estimated. You always know which numbers to rely on and which are still guesses.

Progress at a glance

Retest and see what moved, for example your VO₂ max change since the last test.

Five sports, one dashboard

Run, bike, swim, triathlon and Hyrox, each with the right units and targets.

Your test tracker

See which tests you have done, which are still missing, and what each one would unlock.

Your data, your control

Export everything or delete your account in one click. We never sell your data.

Honest about limits

It is a training tool, not medical advice. It tells you when a number is soft.

Try it

This is the dashboard, with sample data.

Switch sports, change the test source and see how the numbers respond.

How it works

Three steps.

1

Create your dashboard

Sign up in a minute. It works straight away and marks anything untested as "Not tested" instead of inventing numbers.

2

Book a Box test

VO₂ max and thresholds, lactate, resting metabolic rate and body composition. Each one fills in a part of your dashboard.

3

Train to measured numbers

Your results appear in your dashboard. Retest every 8 to 12 weeks to see your progress.

The tests behind it

Tested at Box, in Birmingham.

Your zones and fueling are only as good as the data behind them. Box runs the tests that replace the guesses.

VO₂ max and thresholds

Sets your zones and shows how you burn fat and carbs.

Lactate threshold

Confirms your Zone 2 ceiling and hard-effort threshold.

RMR

Your real daily calorie baseline.

Body composition

Lean mass and body fat, for protein and progress.

Book a test
Pricing

Free to start.

Athlete OS dashboard

Your own dashboard, your test results, zones and fueling, with retest tracking. Tests are booked separately with Box.

    Create your free dashboard

    Questions

    What does it cost?

    Free to start.

    Do I need a test to use it?

    No. You can start without one, and anything untested is clearly marked. A test replaces the estimates with measured numbers.

    Can I connect my watch?

    Your test results appear in your dashboard straight away. Connecting Garmin, Coros or Strava for your daily training data is the next thing we are building.

    What happens to my data?

    Your results are stored securely and used only to run your dashboard. You can download everything or delete your account at any time from inside the dashboard. We never sell your data. Read the privacy notice.

    Is this medical advice?

    No. It is a training tool. Sharp pain, illness or anything medical should go to a professional. Read the terms.

    Which sports does it support?

    Running, cycling, swimming, triathlon and Hyrox. You choose your sport at the top of the dashboard.