I recently saw a man that gave me golf specific exercises. One of them is the ONE LEGGED SQUAT. This one is pretty difficult... especially since I have a problem with the right SI Joint. I was told that this would help me, however, along with some other exercises for hip, leg, and foot stability.
In their studies... something like 90% of golfers had some instability when moving laterally into the LEFT(lead)LEG.
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