This test will help you measure the overall mobility in your legs, ankles, shoulders and spine. If you are unable to perform this test, it is likely that you will not able to maintain your spine angle throughout your downswing. The natural tendency is to thrust your hips toward the ball at the start of the downswing, thus pulling yourself up and out of the shot causing an array of errant shots and loss of power. Low results in the overhead deep squat test may be related to C and S-postures and lack or rotation.