Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Feet shoulder-width apart, knees slightly bent. Barbell across upper back, hands slightly wider than shoulder-width. Engage core, chest up. Rotate torso right, hips forward. Return to center, then rotate left. Alternate sides.
Control movements to engage muscles and prevent injury. Initiate twist with obliques, not arms. Maintain a slight knee bend for lower body stability. Keep hips square; avoid rotation. Exhale during twist, inhale returning to center.
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