Smart training for iPhone and Apple Watch

Acta Fit App

Effort you can build on.

Lifts, race stations and runs in one log. Your iPhone and Apple Watch share one live workout.

Download on the App Store

On the App Store in the United States and Canada.

Acta Fit live workout: Deadlift set 3, 315 lb PR Acta Fit live workout: Sled Push race station Acta Fit workout summary: Lower Strength, session volume PR

Track any workout. Use your AI as your coach.

Live fit. Acta Fit.

Bring your own coach

Your log, read by the AI you already use.

Acta Fit keeps every set, split and station in a form any assistant can read. Open the one you already use, point it at your log, and build the next block together.

  • OpenAI
  • Claude
  • Grok
  • Gemini
Add Acta Fit to ChatGPT
Chatting with
Acta Fit log
Are Tuesday's sleds costing me Sunday's long run? Build next week around whatever you find.

Yes, a little. Across your last six weeks in Acta Fit, Sunday pace drifts whenever Tuesday sled volume goes above 8 × 20 m:

Heavy sled weeks4:47 / km
Light sled weeks4:35 / km

Heart rate on those Sundays is the same, so it's leg fatigue, not fitness. For next week I'd move sleds to Wednesday, cap them at 6 × 20 m, and keep Sunday at 22 km. Want me to write that into your plan?

Yes, and add a swim on Friday.

Questions

Does Acta Fit work on Apple Watch?

Yes. You log sets, rest, and edits from the Apple Watch.

Do my iPhone and Apple Watch stay in sync?

Yes. During a workout they stay in live sync. Sets, rest, and edits pass between them.

If the Watch link drops, does it come back on its own?

If the link drops while the Watch workout is still running, the Watch keeps trying to rejoin on its own until the workout ends. The live workout can still pass between your iPhone and Apple Watch while it does. If another workout has the Watch, Acta Fit waits and does not start a replacement session.

Does Acta Fit have built-in AI?

No. Acta Fit has no built-in AI. You connect your own MCP-capable assistant.

Which AI can I connect?

Any MCP-capable assistant, for example Claude or ChatGPT where supported.

Does Acta Fit support fitness racing and hybrid training?

Yes. Lifts, race stations like sled push, wall balls, and ski machine, and runs are in one log.

Is Acta Fit affiliated with any race series?

No. Acta Fit is not affiliated with any race series.