Part 1: Ankle Mobility
The importance of ankle mobility for your golf swing can not be overstressed. The ankle needs to be mobile enough to allow you to transfer your weight in both backswing and downswing. If your ankles are tight you wont be able to move your lower leg or rotate it during the swing. Furthermore your knees will not be properly loaded and wont be able to keep your hips stable during the swing! Your swing will suffer and will lead to faulty movement patterns which is the most common cause of injuries in golf. So it is vital that you keep your ankles nice and mobile as the golf swing really does start from the ground up.
Exercise: Ankle windshield wipers.
Grab a chair that allows the upper leg to be parallel to the ground. Place your two palms together and put these between your two knees. Keep your feet directly under your knees and lift them off the ground. Turn your feet to the left as far as possible and then to the right as far as possible. Just imagine it’s the motion of the windshield wipers of your car! It’s important there is no forward or backward movement and perform the movement controlled and slowly.