How to do it: Begin with a 20- to 30-inch box or bench right behind you. Straighten one leg and lift your foot in front of you, bend your standing leg, and push your hips back as far as possible as if you’re squatting on two legs, but just doing it on one. Continue until your butt hits the bench, pause, then squeeze your glutes and drive through your planted heel to stand up. Do not relax and release the tension in your muscles as you sit. Repeat this movement, alternating sides each time. (Once you master lowering to touch your glutes to the bench, lower the bench or try lowering to the floor.)
However, even the things you do every day — like sitting in front of a computer or at a desk for hours — can both weaken and shorten (tighten) your hip flexors, making them more prone to injury. Because of this, exercises (such as squats) and targeted stretches which focus on strengthening the hip muscles and improving hip mobility are key to preventing injuries.
Nerve impingements arising from your lumbar spine: Your lower back can refer pain anywhere into your buttocks and legs. The area it refers to depends on which joint in your spine is at fault. If it is a joint high in your lower back you may feel pain in your hip also. This relationship is due the referral pattern of the nerve impinged. Treatment in this case should be by a suitably qualified physiotherapist or medical professional to the joint in your spine that is impinging the nerve.
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But there are some pretty serious causes for back and hip pain as well. Lower back pain, in particular, can be a sign of various serious conditions such as advanced kidney infections or a condition called interstitial cystitis, which can cause inflammation of the tissues of the bladder. Sciatica causes lower back pain, pain in the back of the knee, pain in right buttock cheek, unilateral (one-sided) pain, thigh pain, pain behind the knee and calf, and muscle weakness in legs as well.

In the vast majority of patients with low back pain, symptoms can be attributed to nonspecific mechanical factors. However, in a much smaller percentage of patients, the cause of back pain may be something more serious, such as cancer, cauda equina syndrome, spinal infection, spinal compression fractures, spinal stress fractures, ankylosing spondylitis, or aneurysm.
An ischial apophysis avulsion is an injury to the sitting bone where the hamstring muscle meets the bony protrusion of the sitting bone or ischial tuberosity. An avulsion is an injury in which movement or injury results in a violent and sudden contraction of the hamstring which pulls a piece of the sitting bone with it. This injury typically affects young athletes, aged 13 to 25 years. Symptoms include ischial tuberosity pain, swelling and pain in the thigh area, muscle spasms, and muscle weakness in the legs. To heal the injury, extended rest and massage are typically in order as well as stretching exercises and gait work.
I call it the true hip flexor stretch as I want you to truly work on stretching the hip flexor and not just torque your body into hip and lumbar extension.  It’s very easy for the body to take the path of least resistance when stretching.  People with tight hip flexors and poor hip extension often just end up compensating and either hyperextend their low back or stress the anterior capsule of the hip joint.
Grade III (severe): A complete tear in your muscle that causes severe pain and swelling and you can't bear weight on that leg, making it difficult to walk. You've also lost more than 50 percent of your muscle function. These injuries are less common and may need surgery to repair the torn muscle. They can take several months or more to completely heal.
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