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Tight hamstrings are a common problem for many men.
They can affect the alignment of your legs, hips and spine. To compensate you may be tilting your pelvis, which can lead to back strain. Lie on your back with your feet flat on the floor and knees bent. Straighten your right leg and, without raising your glutes off the floor, bring it up until your thigh is perpendicular to the floor. If you can't come close to 90 degrees, your hamstrings are tight.