Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Set the preacher bench so upper arms rest comfortably with elbows slightly bent. Attach a bar to a low pulley cable machine. Sit on the bench, grasp the bar with an underhand grip, hands shoulder-width apart. Start with arms extended, maintaining cable tension. Curl the bar upwards, keeping upper arms stationary. Pause at the top, forearms vertical, biceps contracted. Slowly lower to the starting position, controlling the weight. Repeat.
Maintain a straight back. Squeeze biceps at the top. Use a controlled tempo, avoid swinging. Ensure a full range of motion. Start with lighter weight. Maintain a firm grip.
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