Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Feet shoulder-width apart, knees slightly bent. Interlock fingers behind back, palms together. Gently straighten arms, lifting them away from your back. Inhale, expand chest, pull shoulders back and down. Hold for 15-30 seconds, breathe steadily. Slowly return to start.
Engage your core for balance. Avoid excessive lower back arching; focus on chest opening. Use a towel or strap if fingers don't interlock. Perform regularly for posture and upper body tension relief. Control movements to prevent strain.
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