Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Attach a bar to a high pulley cable. Stand facing away, gripping the bar with an overhand grip. Step forward to create tension, feet shoulder-width apart. Raise the bar overhead, elbows close to your head, core engaged. Inhale as you lower the bar behind your head, bending your elbows. Exhale and extend your arms back to the start, fully contracting your triceps. Repeat.
Keep elbows stationary and close to your head. Maintain a slight bend in your knees for stability. Engage your core. Use a controlled weight. Avoid full elbow lockout.
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