Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Engage your core, pressing your lower back into the dome. Simultaneously lift your extended leg and opposite arm towards the ceiling. Pause briefly with the leg perpendicular to your torso, then slowly lower back to the start. Repeat, alternating sides.
Focus on keeping your ribs down to stabilize your torso and prevent excessive arching in your lower back. Brace your core muscles firmly throughout the movement to protect your spine and enhance stability. Imagine reaching long through the extended arm and leg, maintaining a straight line from fingertip to heel to maximize the stretch and engagement. Consciously control the natural curve (dome) of your lower back, preventing it from flattening or over-arching during the exercise.
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