two other examples of good shoulder strengthening exercises using the resistance band
are shoulder flexion and shoulder extension
both of these are vital for starting and stopping with throwing motion
so shoulder flexion, is when you're going to be bringing the arm forward
something like this
shoulder extension is going to be the opposite
bringing the arm backwards, like this
a few things to remember is to stay in a good athletic position
and don't hike the shoulder up
keep it down to keep the trap relaxed
give this a try
