Variation of the Chest Fly with a spinal rotation. Asymmetrical work that strongly activates many stabilizing muscles, mainly the external obliques on the active side and the internal obliques on the opposite side. @muscleandmotion 💪Target muscle: Pectoralis major Action: Shoulder horizontal adduction 💪Synergist: Anterior deltoid #chestexercise #chestfly #chestworkout #muscleandmotion http://www.muscleandmotion.com/products/strength-training-app/ | Muscle and Motion