Whenever you go to on ground function, be sure there's something you can't get upright. This is Steve Myrland demonstrating his "frog". It is one in a series of crawls, each with an animal name, and each creating a movement puzzle for the body to solve. They really integrate & challange core/glenohumeral stability.
You may contact Steve @ Myrland Sports Training, (608) 836-4701.