Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit on a bench, feet flat, shoulder-width apart. Hold a dumbbell in each hand, palms facing each other. Hinge at the hips, back straight, chest above knees. Let arms hang, slightly bent. Raise dumbbells to the sides, arms parallel to the floor. Pause, squeeze shoulder blades. Lower slowly. Repeat.
Engage your core. Avoid swinging; use controlled movements. Maintain a slight elbow bend. Keep your back straight. Exhale on the lift, inhale on the lower. Start with lighter weights.
MuscleTrain is actively being built. If something looks broken, or you have a suggestion, let us know — it really helps shape the app.