Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Lie on your back, knees bent, feet flat. Extend one leg straight, aligned with your thigh. Engage your core, press through the grounded foot to lift hips, forming a straight line from shoulders to knees. Squeeze glutes at the top. Slowly lower hips back down without touching the ground. Repeat, alternating legs.
Maintain core engagement for stability. Keep the extended leg straight and aligned. Squeeze glutes at the peak. Avoid lower back arching; maintain a neutral spine. Control the movement throughout.
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