The snow angel slide is a simple shoulder prep exercise to improve scapular control and stability along with shoulder mobility.
 
Grip the ends of a band running behind your back. With straight arms, keep the shoulder blades squeezed back and down while you perform a snow angel motion to move the hands from the sides to overhead—maintain tension on the band at each end of the motion, which will mean you don’t move the arms completely into the overhead position.
 
Purpose
The snow angel slide is a simple shoulder prep exercise to improve scapular control and stability along with shoulder mobility.  
 
Programming
This is a good preparatory exercise for use in a warm-up. 1-3 sets of 15-30 reps are appropriate.
 
Variations
Snow angel slides can be combined into a complex with band pull-aparts.