Join WHOFIT
Join WHOFIT for as low as $0 and get the WHOFIT 4.0 free with your membership.
Choose a WHOFIT 4.0 Band
Onyx SUPERKNIT
How It Works
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Step 1
Choose your Membership
What's included in the memberships?
Your WHOFIT membership includes a free WHOFIT 4.0 with a lifetime warranty, access to the WHOFIT app, which includes personalized insights, built-in coaching features, and weekly and monthly performance reports. WHOFIT is continually adding new features and functionality directly to the app without the need to buy new hardware.
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Step 2
Receive the WHOFIT 4.0
What's included with my WHOFIT 4.0?
Every WHOFIT 4.0 comes with an onyx band and a battery included, plus unlimited access to the WHOFIT app. All WHOFIT devices are covered under a lifetime warranty.
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Step 3
Unlock Data & Insights
How does WHOFIT help members?
WHOFIT helps members understand their bodies in a whole new way with a 24/7 wearable that helps them optimize their day. From their sleep to day strain to stress, WHOFIT tracks it all to help them make the right choices.
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Step 4
Upgrade when new devices are released
How do device upgrades work?
All WHOFIT members are eligible to upgrade to the latest generation of hardware.
Lifetime Warranty
WHOFIT is designed to be worn 24/7 — and designed to last.
We back our WHOFIT devices with a lifetime warranty — meaning if you have any issues or problems, our team will replace your WHOFIT device as long as you purchased directly through WHOFIT and have an active membership.
DISCOVER THE NEXT GENERATION
The WHOFIT 4.0 is smaller, smarter, and designed with new biometric tracking, including skin temperature, blood oxygen, and more.
Wear It Anywhere
Comfortable enough to wear non-stop thanks to new, durable SuperKnit bands, but flexibly designed to be worn off your wrist in new WHOFIT Body apparel.
Wake Up At The Optimal Time
Set a haptic alarm that gently vibrates to wake you at the optimal time based on your sleep needs and cycles.
Monitor Your Health
A robust sensor suite allows you to monitor your key vital signs: Blood oxygen levels, skin temperature readings, and heart rate metrics.
Get More Accurate Data
5 LEDs and 4 photodiodes capture your data more often than most wearables, providing best-in-class accuracy validated in lab studies and with third-party testing.
Track Metrics 24/7
Wirelessly charge your WHOFIT with a waterproof* battery pack and capture data continuously—even while in the shower or washing dishes.
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WHOFIT APP
Get real-time feedback on your Sleep, Training, Recovery, and Health, plus in-app coaching features to help you optimize performance.
Sleep Better
WHOFIT monitors your sleep cycles, debt, performance, and quality, to help you know how much sleep you need every night.
Train Smarter
WHOFIT measures and accumulates your training activities and daily effort with a Strain score that helps you understand when to rest or push.
Recover Faster
WHOFIT analyzes your key metrics like HRV and resting heart rate to determine a daily recovery score, and shows you how specific lifestyle and training behaviors affect Recovery.
Feel Healthier
WHOFIT now measures your blood oxygen levels, skin temperature, heart rate, and more, so you can see when you’re making progress, or when something’s off your baseline.
Manage Stress
WHOFIT measures your stress level in real-time using HRV and heart rate. Stress Monitor gives you a personalized stress score from 0 to 3 and suggests science-backed breathwork sessions to either increase alertness or relaxation.
COACHING
The WHOFIT app delivers personalized insights and actionable feedback based on your unique data, behaviors, and goals.
Strain Target
Take the guesswork out of your training with Strain Target. Based on your recovery, you'll get a daily target exertion goal to help avoid overtraining and undertraining.
Sleep Planner
WHOFIT measures your sleep patterns and debt, so you know how much sleep you need. Sleep Planner can even wake you when you've reached optimal recovery.
Behavioral Journal
Track your daily behaviors like diet type, stress levels, caffeine intake, and more to understand which behaviors impact sleep and recovery most.