Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit with knees bent, feet flat, and lean back slightly to engage your core. Hold hands together or grasp a weight. Rotate your torso to the right, bringing hands/weight to your hip. Return to center and repeat on the left side. Continue alternating.
Maintain a straight back. Engage your core by drawing your navel towards your spine. Control the twisting motion; avoid momentum. Start with a light weight if using one. Breathe steadily, exhaling during the twist.
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