How it works
From first beat to weekly progress.
Four steps, and the math stays out of your way. Here's the whole loop.
Pair your strap
Connect any Bluetooth heart-rate monitor — chest strap or armband. No strap yet? You can still explore the app.
Pick your goal
Fat loss, endurance, performance, or speed. This sets the single zone your weekly target will track.
Start a workout
Hit go and watch the gauge. Stay in your target zone, or push higher when the session calls for it.
Recover & review
We measure your 60-second recovery, then save your zones, calories, and trends to your history.
The zones, and what each one does
Max heart rate is roughly 220 minus your age. Your zones are bands of that number. Lower zones build your base; higher zones sharpen the top end.
Warm Up
Easy, conversational
Endurance
Comfortable, all-day pace
Aerobic
Working, but in control
Threshold
Hard, breathing heavy
Peak
All-out, seconds at a time
Goals map to one zone
Your weekly minutes count only when you train in the target zone for your goal.
Burn fat, keep muscle. Long, steady, low-intensity work.
Zone 2Build aerobic capacity and a stamina base that lasts.
Zone 3Raise your threshold and tolerance for hard efforts.
Zone 4Sharpen top-end power with short, explosive intervals.
Zone 5Stop guessing. Start training in the zone.
Free to download. Pair any Bluetooth strap and your first session is one tap away.