Straighten your knee and lean over, sliding your hands down your shin until you feel the back of your thigh begin to stretch. Do both legs, holding the stretch for 10-20 seconds each. Modify your swing if you're feeling pain . The modern swing, emphasizing maximum upper body rotation with minimal rotation of the pelvis, has much more negative impact on the back than the long flowing back swing with large hip turn and raised left heel. Always bend at the knees , not at the hips, when teeing up or retrieving your ball from the cup.
Proper posture is important.
Ideally, use a caddie . If not, pushing a handcart is preferable to pulling it. Riding in a golf cart aggravates tight hamstring muscles and causes repeated shock waves to the intervertebral discs. A longer putter reduces bending forward and strain on the low back muscles. For more information, contact the American Academy of Physical Medicine and Rehabilitation, Dept.