You know the exercise.
Now know the muscle.
Turn the body, tap what you want to know, and read the page: origin, insertion, actions and innervation set like a textbook — next to a plain answer to what the muscle does and what trains it. 56 muscles. 712 exercises.
56
Muscles with a full page
712
Exercises, cross-linked to every muscle they train
3
Depth layers, surface to deep
What This App does
01
The body, not a list
Turn the model and tap what you want to know. No guessing which of six names on a dropdown is the muscle you can feel — you point at it, and the page opens.
02
Textbook and plain language, same page
Origin, insertion, actions and innervation, written the way a textbook writes them. Beside that, why the muscle is usually under-trained and what patterns it — written the way a coach says it.
03
Exercises that name the fault
Numbered technique, then the specific mistakes that make a movement stop working — leaning back through a pulldown, cutting a squat at parallel. Faults, not motivation.
Why your back never feels it
Lats — and the three ways people train around them
Every pull bends the elbow, so the biceps will happily take the whole set. Each exercise page names the exact fault, and what to do instead.
- Pull-Up
Pulling with the arms. Because every pulling movement bends the elbow, the biceps will happily take over the whole set and the back will feel nothing. Thinking about driving the elbows down toward the hips rather than pulling the chin up is the standard fix.
- Wide-Grip Lat Pulldown
Leaning back further and further as the set goes on. Once the torso is swinging, the load is being moved by momentum and the lats are doing less than a lighter weight would ask of them. Pick an angle and hold it.
- Barbell Deadlift
Letting the bar drift away from the legs. Every inch forward increases the leverage the weight has against your lower back. Keeping the lats engaged — think about squeezing an orange in each armpit — is what holds it close.