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Ostrow says golfers must have loose hamstrings. In his testing, players with tight hamstrings tend to rise out of their posture during a swing, leading to inconsistent contact with the ball. Players with loose hamstrings were better able to stay in proper golf posture during the swing. This exercise can be performed by players with bad backs.

While keeping the back flat on the floor, lift one straightened leg onto the wall and hold the position. Alternate legs.