Big Space
Ersha
All Gain, No Pain
Your heart knows the way to fitness. Ersha listens, guiding you to effort that builds instead of breaks. Real cardio happens in the easy zone.
iPhone and Apple Watch
Blue light means you're perfect.
Drift too high, we'll nudge you to ease up.
Track your workouts and see your time in zone.
You've tried before. You pushed through. And then you stopped.
Not because you're lazy. Because it was awful.
The struggle itself is the problem. One brutal workout teaches your brain that exercise is a threat. Eventually, you quit—not from weakness, from self-preservation.
Ersha does it differently.
Ersha uses your Apple Watch heart rate to keep you in Zone 2—where real cardio builds without the suffering. Blue light means you're perfect. Drift too high, we'll nudge you to ease up. That's it.
Features
- Real-time Heart Rate Zones
- See your heart rate zone on your Apple Watch as you move.
- Visual and Haptic Guidance
- Blue light when you're in the zone. Gentle nudges when you drift.
- Session Tracking
- Track your workouts and see your time in zone.
- No Account Required
- Just open the app and go. No signup, no login.
- Your Data Stays On Your Devices
- We don't collect, track, or share anything.
- No Guilt Mechanics
- No streaks, badges, or notifications shaming you.