HOW: Lean up against an elevated surface. The higher the surface the easier, the lower the more challenging. Initiate this exercise by pushing your body away from the surface. Now elevate one arm and tap the opposite shoulder. Stay strong in your core and shoulder blade, try to maintain the same body position you would be in if both of your arms were grounded. Tap each shoulder very slow and controlled the entire movement should take at least 3 seconds per side.
FEEL: You will feel the muscles on the front of your shoulders as well as your core working with this exercise.
COMPENSATIONS: Avoid rotating your body or allowing your shoulder blade to sag as you perform this exercise.