Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand facing a wall, feet shoulder-width apart. Grip a barbell underhand, hands shoulder-width apart. Keep elbows pressed against the wall. Inhale, curl the barbell upwards, flexing your biceps until the bar reaches shoulder level. Pause, squeeze biceps. Exhale, slowly lower the bar back to the starting position, maintaining control. Repeat.
Maintain back contact with the wall. Use only your biceps; avoid swinging. Keep wrists straight. Start with a lighter weight. Control tempo. Engage your core.
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