Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand with feet hip-width apart, holding a dumbbell in each hand at your sides or in front of your thighs. Keep your chest up, shoulders back, and core engaged. This is the starting position. With a slight bend in your knees, hinge at your hips and lower the dumbbells down the front of your legs. Lower until you feel a stretch in your hamstrings, keeping your back flat. Push through your heels to stand back up, driving your hips forward. This is one rep. Return to the starting position and repeat for reps.
Keep core engaged to protect spine. Push hips back, not down. Drive through heels, not toes. Keep dumbbells close to body. Move slowly and with control.
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