Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Lie on your back, legs straight, with palms flat on the floor. Keeping your lower back pressed down, slightly elevate your legs. Then, alternate raising and lowering your legs in small, deliberate motions, emphasizing core activation.
Maintain consistent lower back contact with the floor. Use short, quick leg movements. Breathe evenly to help control the motion and build stamina. Actively engage your abdominal muscles for stability.
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