Knowing a muscle is sore is easy. Knowing whether it's ready to be trained hard today is the useful part, and that's what this tracks. 19 muscle groups, a body map you can read in a second, and an engine that turns all of it into your next workout.
Front and back views of your whole body. Whatever you worked lights up by how hard it got hit, heavy through moderate to light, and fades back to neutral as it heals. You don't have to interpret anything. If it's still coloured in, it's still coming back.
Recovery is tracked across legs, chest, back, shoulders, arms and core, but each of those breaks down further, 19 subcategories in total. Your chest is upper, middle and lower separately. That matters, because an incline press and a dip do not leave you in the same state.
Switch to Muscle Breakdown and every group gets a label and a number: CRUSHED, IN RECOVERY, or RECOVERED, with a percentage and how long is left. Expand a group and you see it muscle by muscle, along with the exercise that did the damage.
A muscle that was the star of the session gets a longer clock than one that was just helping out, and the windows scale with your training experience, following established recovery research. A newer lifter and a seasoned one doing the same squat session are not in the same place the next morning.
Football on Sunday, a class at another gym, a session you never logged? Tap Mark crushed muscles, select what feels wrecked, and it counts. The tracker is only as good as what it knows about, so this is the feature that keeps it honest.
This is where a recovery tracker stops being a dashboard. The same data drives what you get told to train: muscles at 80% or better go into the pool, everything else waits, and your next session is built from the difference.
A tool that models how far each muscle group has progressed through recovery after training, usually shown on a body map, so a lifter can tell which muscles are ready to be trained again and which still need time.