If you’re someone who’s got a good stretching routine down, both before and after a HIIT workout, bike ride or run, odds are the discomfort you feel indicates that there are grounds for more strengthening exercises. It’s important to add that many yogis with extremely flexible hips run into overstretching injuries like hip flexor strains. But, these injuries aren’t just limited to the uber-flexible. Runners, cyclists, and Stairmaster lovers might strain these muscles due to frequent overuse. We’ll share a hip flexor workout below but, first up, some stretches.
When hip pain comes from muscles, tendons, or ligament injuries, it typically come from overuse syndromes. This can come from overusing the strongest hip muscles in the body such as iliopsoas tendinitis; it can come from tendon and ligament irritations, which typically are involved in snapping hip syndrome. It can come from within the joint, which is more characteristic of hip osteoarthritis. Each of these types of pain present in slightly different ways, which is then the most important part in diagnosing what the cause is by doing a good physical examination.
Hamstring squeeze. Use the machine that works your hamstrings; you will either lie on your stomach or sit with a pad behind your knee. Push against the pad, moving your knee up toward the ceiling or backward (depending on which position you’re in). “In other words, bend your knees,” Pariser says. But to avoid cramps in your hamstring muscles, don’t bend your knee so much that your heels are too close to your buttocks.

^ Jump up to: a b c d e f g Hughes SP, Freemont AJ, Hukins DW, McGregor AH, Roberts S (October 2012). "The pathogenesis of degeneration of the intervertebral disc and emerging therapies in the management of back pain" (PDF). J Bone Joint Surg Br. 94 (10): 1298–304. doi:10.1302/0301-620X.94B10.28986. PMID 23015552. Archived from the original (PDF) on 4 October 2013. Retrieved 25 June 2013.
Lie on your back with your knees bent and your feet flat on the floor. Tighten the muscles in your buttocks, then lift your hips off the ground and hold for about five seconds before slowly lowering yourself back down. Be sure to breathe throughout the exercise. As with the first exercise, you can work up to doing 30 repetitions, resting for a few seconds (or longer) between each. “If you start to get tired, stop and rest for a couple of minutes,” Pariser says.
Iliopsoas syndrome, which is also called psoas syndrome or iliopsoas tendonitis, occurs when the iliopsoas muscles are injured. Lower back pain is the most common symptom; however, pain can also occur in the hip, thigh, or leg. The iliopsoas bursa, which is a fluid-filled sac located on the inside of the hip that reduces rubbing and friction, is also likely to become inflamed due to the proximity of the two structures. When this happens, the inflamed bursae will make it difficult to move.

Low back pain (LBP) is a common disorder involving the muscles, nerves, and bones of the back.[4] Pain can vary from a dull constant ache to a sudden sharp feeling.[4] Low back pain may be classified by duration as acute (pain lasting less than 6 weeks), sub-chronic (6 to 12 weeks), or chronic (more than 12 weeks).[3] The condition may be further classified by the underlying cause as either mechanical, non-mechanical, or referred pain.[5] The symptoms of low back pain usually improve within a few weeks from the time they start, with 40–90% of people completely better by six weeks.[2] 
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