Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Lie on your back, legs extended, arms at sides. Keeping legs straight and together, lift them towards the ceiling, engaging your core. Raise legs to a 90-degree angle (or as far as comfortable without arching your back). Pause, then slowly lower with control.
Keep lower back pressed against the mat. Engage your core (pull belly button towards spine). Exhale on leg lift, inhale on descent. Bend knees slightly if needed. Start with a smaller range of motion. Avoid momentum; focus on controlled movements.
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