Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand with feet shoulder-width apart, holding dumbbells. Hinge at the hips, leaning forward with a straight back. Arms hang naturally. Engage core, retract shoulder blades. Pull dumbbells to ribcage, squeezing shoulder blades. Pause, contracting rear delts. Lower slowly with control. Repeat.
Maintain a straight back, avoid rounding shoulders. Pull with elbows to engage rear delts. Control the movement, avoid momentum. Keep neck neutral, look ahead. Prioritize form over weight. Inhale on lower, exhale on lift.
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.