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.)

Because you won’t stop stretching them. Many people who have consistent hip flexor tightness would be a lot better off if they just stopped stretching them. This often provides only a temporary relief, giving just a small window of comfort. And guess what? The more you stretch them, the shorter that window of relief becomes, until you’re at the point where you’re stretching them multiple times a day for a long duration just to feel good! That’s no way to live!

5. Feel free as a bird. Open up those hips with yoga’s pigeon pose! Start on all fours with hands below the shoulders and knees below the hips. Bring the right knee forward until it touches the right hand and place the leg flat on the ground across the body (the right foot is now on the left side of the body, parallel to the front of the mat). Drop left leg to the ground, and extend it back with toes turned under. Keep the hips level, inhale, and walk hands forward. Exhale, and fold the torso over, lowering elbows to the floor. Stay in this position for 5-10 breaths before coming back up to switch sides.
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.
This pose is one of the most comfy ones for the lower back and hips. It will also stretch your neck, shoulders, and chest. Lie on your back and hug your knees into your chest. Breathe in deeply, and then exhale completely, lowering both legs to the floor on your left (keep your knees higher than your hips). Position your arms out to your sides, or place your left forearm on your right thigh (as pictured) to encourage a deep stretch, relaxing both shoulders to the floor. Shift your gaze over your right shoulder. Close your eyes, take 10 deep breaths, and then release. Repeat to your other side.
A sedentary lifestyle can lead to having weak and tight hip flexors as they are always in the shortened position. Tight hip flexors can lead to a limited range of motion, poor posture, lower back and hip pain, and even injuries. These muscles need to get a workout when you are standing and doing movements such as raising your leg to climb stairs, run, or ride a bicycle.​
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