Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit on a bench, feet flat, legs slightly apart. Grip a barbell with an underhand grip, resting forearms on thighs, wrists extended. Curl the barbell upwards, flexing wrists. Pause at the top, contracting forearms. Lower slowly, extending wrists fully. Repeat.
Keep forearms stationary. Use a lighter weight. Achieve full range of motion. Exhale on curl, inhale on lower. Avoid momentum. Maintain a firm, relaxed grip.
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.