Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand with feet hip-width apart, using a wall for balance if needed. Shift weight to one leg, lifting the other slightly. Engage your core, maintain a straight posture. Slowly raise your heel as high as possible, keeping the knee straight. Pause, then lower with control. Repeat on the other leg.
Engage your core for balance. Perform slowly for muscle control. Keep the knee straight, but unlocked. Use a full range of motion. Use support as needed. Progress to added resistance.
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