Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Set incline bench to 30-45 degrees. Lie face down, feet firmly planted. Hold a dumbbell in each hand, palms facing each other. Extend arms down. Engage core, head neutral. Raise arms to parallel, forming a 'T'. Squeeze shoulder blades. Lower slowly. Repeat.
Use light weights for control. Squeeze shoulder blades on lift. Keep elbows slightly bent. Avoid momentum. Maintain neutral spine. Exhale on lift, inhale on lower.
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