Hamstring Pull
Tight hamstrings are weak hamstrings. And tight, weak hamstrings can pull the pelvis into anterior pelvic tilt. The upper connection of the hamstrings becomes weaker as that connection becomes tighter, preventing its proper function in keeping the pelvis properly aligned. Knowing this, you need to start stretching your hamstrings. Google hamstring stretches and in .0001 seconds 6 billion results will be staring you in the face...