Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand with feet hip-width apart, core engaged, chest up. Drive one knee to hip height, shifting weight to the opposite leg. Maintain a slight bend in the standing leg. As the lifted foot plants, immediately curl the opposite heel towards your glute, squeezing the hamstring. Alternate legs, maintaining a rhythmic pace and natural arm swing. Exhale on the knee drive, inhale on the heel curl.
Maintain an upright torso and drive your knee upward Squeeze your hamstring and slow the tempo for controlled curls Keep a slight bend in your standing knee and focus your gaze forward Allow your arms to swing naturally, complementing the leg movement
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