Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand with feet hip-width apart. Step right, bending your right knee and pushing hips back. Keep left leg straight and right knee aligned with your foot, avoiding extension past toes. Jump back to the center, then immediately step left and repeat. Alternate sides.
Engage your core for stability. Land softly to minimize joint impact. Prevent knee extension past toes. Maintain chest up, shoulders back. Start with a smaller range of motion if needed. Check form with a mirror or feedback.
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