Single-Arm Dumbbell Protractions

Supine and standing single-arm dumbbell protractions for the serratus anterior. Can anyone explain these exercises or post a video?

1/4th of the way down the page. I was going to tell you to use the search function, because I remember this article from a while back on this site, but I couldn’t find it with the search either…

Shoulder Savers Part I


Thank you.