Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit on a bench with back support, feet flat. Grip an EZ bar with a pronated grip, hands shoulder-width apart. Extend arms overhead, elbows close to head. Slowly lower the bar behind your head, bending elbows. Extend arms back to the starting position, contracting triceps. Repeat.
Engage your core for stability. Keep elbows close to your head. Choose a weight allowing proper form. Control the movement. Maintain a straight back.
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