Final answer:
The Double Arm Slam is the battle rope exercise that effectively targets both the chest and shoulders, making it ideal for upper body training.
Step-by-step explanation:
The battle rope exercise that is highly effective for working the chest muscles, alongside the shoulders, is the Double Arm Slam. During the Double Arm Slam, both arms are used simultaneously to lift the ropes high and then slam them down with power. This explosive movement engages the pectoral (chest) muscles, as well as the deltoids (shoulders), providing a comprehensive upper body workout.
The Alternating Waves primarily target the shoulders and arms with less emphasis on the chest muscles. Meanwhile, Inward Circles and Outward Circles are more focused on shoulder mobility and coordination, and while they do engage the chest to some extent, they are not as targeted for chest development as the Double Arm Slam.