Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand upright with your feet hip width apart. Raise your heels off the ground by flexing your calves as far as your range of motion will allow. Controllably return to the starting position.
Keep your posture upright and your core engaged. Focus on a full range of motion—rise up as high as possible and lower your heels slowly.
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