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.
Resisted hip flexion: Stand facing away from a door. Tie a loop in one end of a piece of elastic tubing and put it around the ankle on your injured side. Tie a knot in the other end of the tubing and shut the knot in the door near the floor. Tighten the front of your thigh muscle and bring the leg with the tubing forward, keeping your leg straight. Return to the starting position. Do 2 sets of 15.
Don’t medically investigate back pain until it’s met at least three criteria: (1) it’s been bothering you for more than about 6 weeks; (2) it’s severe and/or not improving, or actually getting worse; and (3) there’s at least one other “red flag” (age over 55 or under 20, painful to light tapping, fever/malaise, weight loss, slow urination, incontinence, groin numbness, a dragging toe, or symptoms in both legs like numbness and/or tingling and/or weakness).
Cauda equina syndrome can be causes by spinal birth defects in children or, in adults, falls, inflammation, malignant tumors, injuries, or, and this is the most prevalent cause—a ruptured disc in the lumbar region of the spine. Symptoms of cauda equina include radiating pain in the lower back, pain and numbness in the legs and lower back, weakness in the lower body, loss of sexual function, and loss of bladder control. Another prominent symptom is upper leg pain, sharp pain in the thigh, loss of sensation in the upper leg muscles, and inner thigh pain. It is critical to seek immediate medical care and often including a neurosurgery consultation,

Premkumar et al present evidence that the traditional “red flags” for ominous causes of back pain can be quite misleading. The correlation between red flags and ominous diagnoses is poor, and prone to producing false negatives: that is, no red flags even when there is something more serious than unexplained pain going on. In a survey of almost 10,000 patients “the absence of red flag responses did not meaningfully decrease the likelihood of a red flag diagnosis.“ This is not even remotely a surprise to anyone who paid attention in back pain school, but it’s good to have some harder data on it.
Those are some great stretches! I own a personal training studio in Severna Park, Maryland. Majority of my clients have physical limitations – so it’s important for them to stay flexible. I send these to my clients and even do these exercises for myself. I highly recommend these stretches to anyone, even people without physical limitations. I love the fact these are actually videos and not just stretches because it’s so much easier for people to figure out how to perform the stretches. You guys are the real MVP!
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How to: Stand with your feet hip-distance apart. Your feet should be flat, and your legs should be straight. Step your right back behind your body, keeping your hips parallel, and stretch your right hand up overhead at the same time. Step back up to starting position. That's one rep. Repeat eight times on each side. Do three to four sets before moving on to the next move, resting for 30 seconds in between each set.
“As a result, they’re at greater risk of injury,” says physical therapist Ioonna Félix, clinical supervisor at the Hospital for Special Surgery’s Sports Rehabilitation and Performance Center in New York City. Many times, those injuries manifest themselves in ways that seem entirely separate from your hips, like IT band issues, low-back pain, or plantar fasciitis.
Good points on isolating the single joint hip flexors and avoiding compensations. I am curious about your perspective (and others) on why this is less likely to stress the anterior capsule? I tend to add trunk side ending before finalizing the stretch to bias the psoas. The stretch you have outlined seems like an iliacus and ant. capsule biased stretch. Thoughts? If I really want to protect the anterior capsule, I’ll also add a slight amount of hip internal rotation.

AAOS does not endorse any treatments, procedures, products, or physicians referenced herein. This information is provided as an educational service and is not intended to serve as medical advice. Anyone seeking specific orthopaedic advice or assistance should consult his or her orthopaedic surgeon, or locate one in your area through the AAOS Find an Orthopaedist program on this website.
I am a science writer, former massage therapist, and I was the assistant editor at ScienceBasedMedicine.org for several years. I have had my share of injuries and pain challenges as a runner and ultimate player. My wife and I live in downtown Vancouver, Canada. See my full bio and qualifications, or my blog, Writerly. You might run into me on Facebook or Twitter.
Sherwin is a Medical Research Scientist and Author of the Low Back Pain Program and eBook. With over 20 years of Research experience from The Toronto General Hospital and The Hospital for Sick Children, he provides sensible, effective, advice and solutions for lower back pain. His eBook has helped thousands of sufferers overcome chronic back pain through safe, targeted exercise and stretching techniques.
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Approximately 15 degrees of hip extension is required to walk normally. If hip flexors are tight then in order to walk, compensatory movement needs to take place through the lower back causing back pain and premature disc degeneration. Like other joints, if we fail to take them through their full range on a regular basis we eventually lose mobility.	

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