The dumbbell reverse fly helps strengthen the muscles responsible for pulling the shoulders backwards, thereby improving upper body posture and movement which is very important for both everyday activities and athletic performance. (fitnessandpower.com)
Here's how to perform dumbbell reverse flies in a way that ensures optimal muscle activation, zero risk of injury and massive strength gains. (fitnessandpower.com)
Moseley et al. (1992) also reported high muscle activity during the prone reverse fly with and without external rotation (96 vs. 108 % of MVC). (strengthandconditioningresearch.com)