This is a great exercise to create lower body strength to increase your power in your swing as well as segmentation of ground up force.
This exercise also creates a load in the trail leg, and a transfer of weight to the forward leg.
Start in a squat position with majority of your weight on the leg that is closest to the ball.
Then thrust your hips up and around while allowing your upper body to follow until you finish with your weight stacked over the forward leg in a finished golf swing.
Do both sides using a 6lb medicine ball and do 2 sets of 10 3 times per week.
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