Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Lie face down. Arms straight out to sides (T-shape), palms down. Engage back, lift arms (core tight, arms straight). Hold briefly. Lower to ground. Repeat.
Thumbs up (to ceiling)—avoid internal rotation/palms down (prevents impingement). Depress shoulders down ("into pockets")—no shrugging (targets mid traps/rear delts). Straight arms like rods—no elbow bend (max rear delt load). Lift to parallel (or below)—no over-height/arching (focus scapular squeeze, save back).
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.