The iliopsoas muscles are a group of two muscles—the psoas muscle and the iliacus muscle—located toward the front of the inner hip. The psoas muscles, in particular, is located in the lumbar (lower) region of the spine and extends through the pelvis to the femur. The iliopsoas muscles are the primary hip flexors, pulling the knee up off the ground when it contracts. Because the psoas muscle is also connected to the spine, it contributes to upright posture, assists in lumbar spine movement, and influences the spine’s curve.

In most episodes of low back pain, a specific underlying cause is not identified or even looked for, with the pain believed to be due to mechanical problems such as muscle or joint strain.[1][4] If the pain does not go away with conservative treatment or if it is accompanied by "red flags" such as unexplained weight loss, fever, or significant problems with feeling or movement, further testing may be needed to look for a serious underlying problem.[5] In most cases, imaging tools such as X-ray computed tomography are not useful and carry their own risks.[9][10] Despite this, the use of imaging in low back pain has increased.[11] Some low back pain is caused by damaged intervertebral discs, and the straight leg raise test is useful to identify this cause.[5] In those with chronic pain, the pain processing system may malfunction, causing large amounts of pain in response to non-serious events.[12]
Other problems may occur along with low back pain. Chronic low back pain is associated with sleep problems, including a greater amount of time needed to fall asleep, disturbances during sleep, a shorter duration of sleep, and less satisfaction with sleep.[24] In addition, a majority of those with chronic low back pain show symptoms of depression[13] or anxiety.[17]
When was the last time you got on your gym's abductor or adductor machine and got in a good workout? It's probably been a while. Both are machines that don't get a lot of use, and they are often the target of coaches' ridicule on those "useless gym moves we should all skip" lists. Perhaps rightly so, especially if you're hopping on those machines hoping for a slimming effect.
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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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