When I was competing in Nova Scotia and at Dalhousie I suffered from back pain as many people do whether they are an athlete or not. However at that time my L5 sat posterior on my S1, so I went to physio and did a lot of core work and the problem was fixed. This isnt always the case for everyone though.
Some of you may not know but your back can be directly effected by the hamstrings! Yep I said it your hamstrings...those muscles in the back of your legs.
The muscles of the posterior thigh are called the Hamstrings. The hamstrings are actually made up of three different muscles. The semitendinosus, semimembranosus and the biceps femoris.
Now when your hamstrings are tight they can limit your mobility and cause back pain as well. The reason is that tight hamstrings will tilt the pelvis backwards which flattens the lumbar curvature also known as the lordotic curve of the lower back.
Trainers use tests to determine injuries or problematic areas. One such test is the leg raise test (lie supine, limbs horizontal, one heel is to be lifted and fez the hip joint with the knee extended.) Sometimes there is pain when this performed and it is commonly confused with siatic pain. When I was in Ottawa competing for the Ottawa Lions I think that I was misdiagnosed with the siatic vs hamstrings because I have had really tight hamstrings in the past and now that I stretch more I have less pain when running.
Also LADIES this lordotic curve that can be effected by tight hamstrings effects your booty...so if youre desiring a delicious booty dont just do squats and lunges till the cows come home work on your hamstring flexibility so you see that lordotic curvature in your back because it will help essentuate your booty!
Here are some hamstring stretches curtosey of The University Of Alberta: