Perform 2 sets of 10-15 repetitions every time you work chest.

Make sure your upper arm stays perpendicular to your body at all times.This is a difficult movement to master at first. It will feel awkward. However, performing this religiously will go a long way towards assuring healthy shoulders.

Choose a light weight to start (typically it will be the lightest weight or NO weight at all).

This can also be performed with dumbells. Just substitute them for the cables shown.

For women I would start with no more than 5 lbs. For men no more than 8-10 lbs. Trust me, this is enough. You'll soon realize why this muscle is a weak link.

Perform slow, steady repetitions. Peform with one hand at a time then repeat with the other hand.

Good Luck!
Starting Position
Middle Position
Ending Position