Rhomboids are a pair of muscles located in the upper back, specifically between the shoulder blades. They play a crucial role in retracting the scapulae, which means they help pull the shoulder blades together. This action is important for maintaining good posture and stabilizing the shoulders during various movements. The rhomboids consist of two muscles: the rhomboid major and the rhomboid minor. Both muscles originate from the spine and attach to the medial border of the scapula. Strengthening the rhomboids can improve upper body strength and reduce the risk of injuries related to poor posture or overuse.