He is doing exercises to strengthen his shoulder blades.

The rhomboid major muscle is a part of the back muscles and plays a role in moving the scapula.

He exercises his rhomboid muscles at the gym every day.

He is working out his muscles at the gym every day.

He was carrying a large load on his back.

Part of this movie is based on actual events.

He struggled to move the heavy box.

His role is the team leader.

He drew a rhombus on the blackboard.

He drew a rhombus on the blackboard.