Workout builder and player
Build the workout. Then press play.
FitBlock turns the session on the whiteboard into blocks you can run. The player counts every set and rest, beeps each transition and keeps your records.
Free during the beta. Runs in your phone’s browser, and installs like an app.
Made of blocks
A routine is a stack of blocks. Each block has its own clock, its own rest and the exercises it runs.
- RoundsThe exercises in order, repeated, each set at your pace.
- EMOMEvery minute on the minute, the next exercise in turn.
- AMRAPAs many rounds as possible before the clock runs out.
- TabataWork and rest intervals: 20 seconds on, 10 off.
- TimedA time cap shared across the exercises.
Everything the session needs
Routines built from blocks
Sets, reps and loads in kg, lb or a percentage of your record. Save a block as a template and reuse it in other routines.
A player that keeps time
One set at a time: it counts up while you work, counts down your rest and beeps every transition. Pause, add ten seconds of rest, keep the screen awake.
Music while you train
Play your own audio files or a YouTube video or playlist with the workout. The music dips while the beeps play.
Records and trends
New personal records are spotted at the end of a workout and wait for your OK. Every weighted attempt is charted over time.
Runs with GPS
Running sets by time or distance. With GPS on, FitBlock measures distance, pace and splits, and keeps only those numbers, never your route.
Calorie sets
Rower, bike or ski erg work in calories: “15 cal row” is a set like any other.
Offline and installable
Add it to your home screen and train without a connection. The workout saves when you’re back online.
Works with AI chat apps
Connect Claude or ChatGPT and ask for a routine, or send a photo of the whiteboard. It lands in FitBlock, ready to preview.
AI apps, through MCP
Ask for the routine. Train it in FitBlock.
FitBlock has an MCP connector, the open standard AI chat apps use to reach other services. Connect Claude or ChatGPT once, sign in to FitBlock, and the chat can build routines, adjust them and look back at your workouts.
- Read-only unless you allow changes when you connect.
- No passwords or keys pasted into a chat.
- Nothing can be deleted, and records always wait for your review.
- Disconnect any time in Settings → AI apps.
No ads. No tracking.
FitBlock has no ads, no analytics and no trackers, and your data is never sold. GPS runs keep distances and times, never where you ran.
Read the Privacy PolicyYour next workout, ready to play.
Sign up with your email or Google account. English and Spanish, light and dark.