Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Sit on a bench with legs extended, hands behind hips for support. Lean back slightly, engage your core, and lift legs a few inches. Alternate kicking legs up and down in a controlled, fluttering motion.
Maintain core engagement and a straight back. Perform the movement slowly and steadily. Breathe consistently. Adjust posture or range of motion if lower back discomfort occurs.
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