Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Stand or sit with a straight back and feet shoulder-width apart. Raise your right arm overhead, bending your elbow towards your upper back. Gently press your left hand on your right elbow to deepen the stretch. Hold for 15-30 seconds, feeling the stretch in your triceps and shoulder. Repeat on the opposite side.
Engage your core. Avoid arching your back. Breathe deeply. Stop if you feel pain. Best performed post-workout.
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