Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Lie on your back with knees bent, feet flat, and fingertips supporting your head. Engage your core to lift your upper body slightly, drawing your torso toward your thighs. Slowly lower back down, maintaining core stability and keeping your shoulder blades slightly raised.
Tighten your abdominal muscles during the entire exercise. Minimize neck pressure by using a gentle hand placement or crossing your arms. Slightly elevate your shoulder blades between reps to maintain tension. Prevent lower back arching by focusing on core engagement. Control the movement using your abdominal muscles, avoiding momentum.
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