The classic wall slide is ineffective for most people. It doesn't take much to build the skill of keeping your arms on the wall while you slide the hands up and down.

Resisted slides, however, create a forward force angle that requires the rear delts and upper back to become much more engaged – without letup – through the entire set.

Maintaining wide elbows and a neutral spine position becomes a lot harder than it is with traditional wall slides, but it doesn't take much weight to get the benefits from this movement, as long as technique is maintained.

Related:  6 Easy Exercises You Won't Be Able to Do

Related:  4 Exercises for Real Posture Improvement