Rear-Delt Cable Fly or Dumbbell Rear-Delt Fly: Which Is Better?

The rear-delt fly exercise can be performed with cables or dumbbells, and either version is a solid choice for isolating the posterior head of the shoulder muscle. But our Editor-in-Chief, Sean Hyson, CSCS, breaks down which of the two is the best choice and how to do it for the best gains.