Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Start in a half-kneeling position (right knee down, left foot forward, 90-degree angle at both knees). Maintain an upright torso and engaged core. Reach back and grasp your right ankle/foot, pulling it towards your glutes to feel a stretch in your right thigh. Hold for 20-30 seconds, breathing steadily. Release and repeat on the left side.
Align front knee over ankle. Keep hips square. Use a strap if needed. Maintain a straight back.
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