If you're finding the knee wants to move to the outside of the arm it may be you are not arching enough per pop up. Try to make sure your locking those elbows out as straight as possible before performing the pop up.
There is a video in the learning were Ant mentioned the same thing and if I remember correctly that was basically Clayton's explanation of it. Don't have time to look for that specific video at the moment though as I'm at work...and they are actually making me do things today.... the nerve of these people!
Commented on Hi all you OMBE people!Regarding the ...
19 Nov 03:26
Believe this is the video. About 1:35 mark.
Follow Along: Land-based Dr...