Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand with feet shoulder-width apart, holding a weight plate or dumbbell close to your chest. Engage your core, maintain a straight line from head to knees. Bend knees, lean back, keeping hips extended and torso upright. Lower until knees are fully flexed, heels on the ground. Pause, then push through heels to return to start.
Start with a light weight to master form. Keep your core tight, knees tracking over toes. Use slow, controlled movements. A sissy squat bench can provide support for beginners.
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