If this muscle becomes tight, it can alter your posture and can put you at risk for injury. Stretching cold muscles could cause a strain or tear. Stretching your deltoids is a great way to keep your arms loose and flexible and prevent shoulder injuries. We use cookies to make wikiHow great. ExRx.net > Directory > Rear Delt > Stretch. The following deltoid stretches are designed to improve the flexibility of the deltoid muscles (figure 1). Figure 3 – Anterior Deltoid & Pectoral Stretch (right side). X Hold the stretch. Repeat with opposite arm. Repeat with opposite arm. Lateral Delts Start with the basic side delt stretch. Tennis Conditioning Stretch. Lateral Deltoid Muscle. Not only are they one of the best rear deltoid exercises you can perform, but they also stimulate your traps, rhomboids and other upper back muscles to help counteract that anterior/posterior imbalance I mentioned earlier. Being aware during this stretch will guide you with your practice. This stretch may be easier to do on one side than the other, which is a sign of a potential muscle imbalance. The rear deltoid and posterior capsule of the glenohumeral joint stretch. Rear Deltoid Stretch. //