Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand with feet shoulder-width apart, using a Sissy Squat bench or stable surface for balance. Engage your core, keep your torso upright, and lean back as you bend your knees. Lower your body, allowing knees to travel forward, maintaining a straight line from knees to shoulders. Descend until knees are fully bent, forming a straight line from head to knees. Push through the balls of your feet to return to the starting position, extending your knees.
Maintain core engagement and a straight line from shoulders to knees. Use a bench or support for balance. Start with a limited range of motion and avoid knee collapse inward.
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