Speaking of Upton the act of turning his rear leg upper portion towards the pitcher is that IR or adduction I am not as gifted or knowedgable as some in this area, to me it seems like adduction but I do not really know, I agree with eversion and stress it to my players when building the foundation.
Here's a bio-mechanics lesson on the rear leg for you.
Here is the muscles and bone movement that I describe in the video above;
When you do the above muscle action while weight is on that leg, the torso moves forward, the leg doesn't move out.
When you do the above muscle action with weight on that leg, the torso twists out externally (to the left), the leg/foot doesn't turn. This is the muscle action that the rear leg, one legged golfer uses to turn his torso.
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