We all want crazy flexible hips, but you also need great shoulder mobility.
This one is for you if you ever get a tired shoulder on your glove side or if you ever want to rip a big windmill save #whodoesnt 
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Seriously though – you need this motion if you are going to use your shoulder efficiently for a good active glove. If you struggle with this one it means you either have a very stiff shoulder or more likely you have a stiff thoracic spine, which means you will also have trouble playing big in the net because your shoulders are rounded forward.
I tell you what to do if you struggle with this one in the video. Whatever you do, don’t ignore it.
If you are more concerned with a wider butterfly and deeper splits, then you probably want this program instead –