Log your sets
Each exercise loads the muscles it works - primary and secondary - by how hard and how much you trained.
Muscle recovery · FreeTrain what's ready.
Train what's ready.
Rest what isn't.
Gym Book turns every set you log into a recovery map of 26 muscle groups, so you know which workout is ready today - and get a warning before you train something still recovering.
iPhone·Android·Wear OS·Mac·Windows
How it works
Recovery, worked out from your training.
Muscles recover
Each group recovers over the next days. On Android, sleep from Health Connect or Samsung Health counts: short nights slow it, long ones speed it up a little.
Train what's ready
The Workout tab shows if your next workout is good to go. Starting one too soon? Gym Book tells you which muscle needs more time.
Up next
Your next workout, ready when you are.
The plan's next day shows on the Workout tab with how recovered it is, and a fresher day in the week when it isn't. Skip it, or start it in one tap with last time's weights filled in.
- Fatigued, recovering, almost and fresh at a glance
- Warnings before you overtrain a muscle
- A lighter weight suggested after a long break
In the workout
Log a set in one tap.
Last time's weights are filled in, the rest timer starts on its own and warm-ups are worked out. Every set updates your recovery.
Built for lifters: free, no ads, works offline.
See your recovery map
Free on Android, Wear OS, iPhone, iPad, Mac and Windows.
FAQ
Questions, answered
How does recovery tracking work?
Every set you log adds fatigue to the muscles the exercise works, and each muscle group recovers over the following days. On Android, sleep from Health Connect or Samsung Health counts too: short nights slow recovery down, long ones speed it up a little. The Workout tab shows whether the next workout is ready, and Gym Book warns you before you train something still recovering.
Is Gym Book free?
Yes. Logging, plans, recovery, progress, nutrition and sync are all free, with no ads. Gym Book Pro adds the AI features (AI plans, the AI coach, AI plan import, physique checks and AI food estimates from a description or a photo), free for everyone for now.
Do I need an account?
Yes, a free one: sign up with your email (or Google on Android, iPhone, iPad and Windows) when you first open the app. It backs up your training and syncs it between your devices. Everything is also kept on the device, so once you're signed in the app works without a connection.
Which devices does it run on?
Android phones, Wear OS watches, iPhone and iPad, Macs and Windows PCs. Your data syncs between all of them. The watch app can run a workout of its own or follow the one on your phone.
Can I use kilograms?
Yes. Pick kg or lbs any time in Profile › App settings › Units, separately for the weights you lift and your body weight.