Medically reviewed by Theresa Marko, PT Your shoulders are composed of three primary muscle groups: the anterior, lateral, and posterior deltoids. The rear delts are a key muscle group responsible for ...

The rear delt fly is a simple exercise targeting the shoulders and upper back that is easy to do poorly. Add an adjustable bench for a more effective approach.

One of the unsung heroes of dumbbell exercises, the lying rear delt fly not only strengthens your shoulder muscles but also helps prevent shoulder injuries. Mastering this exercise will bolster ...

So if you want to build your shoulders without the wear and tear, the rear delt fly should be one of your go-to moves.

Dealing with slumping shoulders and lower back pain? These 6 rear delt exercises (all of which are worth adding to your routine) can help.

2. Standing Dumbbell Fly This exercise is best done with weights, anywhere from five to 15 pounds.

Continue this rear fly and twist for at least 10 repetitions; give yourself a small rest and repeat it at least three times.

This key exercise can make a big difference—if you do it right. Here's what you need to know for better upper body training.