To do this stretch, sit on the floor with your legs about three or four feet apart, depending on how tall you are. Make sure your toes and knees are pointed straight up. Next, take a deep breath, and on the exhale, slowly fold your upper body forward. Rest your hands on your feet, legs, or the floor in front of you and hold this stretch for five deep breaths.
Start in a runner’s lunge, right leg forward with knee over ankle and left knee on ground with top of your foot flat on the mat. Slowly lift torso and rest hands lightly on right thigh. Lean hips forward slightly, keeping right knee behind toes, and feel the stretch in the left hip flexor. Hold here, or for a deeper stretch, raise arms overhead, biceps by ears. Hold for at least 30 seconds, then repeat on opposite side.
Gait analysis studies in the elderly show that they typically have a shortened step length. Whether that is a result of tight hip flexors or due to reduced balance, the propensity to walk with shorter steps will itself lead to tightness in hip flexors and anterior joint structures. Hip stretches may be a relatively easy preventative strategy for the elderly with gait abnormalities and may help to prevent falls.
Well, most of us work the hip flexors (including the psoas and iliacus) most of the time- sitting, practicing while seated, cycling, driving...but only in a limited range, i.e. knees and hips bent to 90 degrees. We need to balance out the movements of the hips a bit more- add more extension and more varieties of flexion. For example, sitting cross legged, sitting on the floor, squatting, kneeling, etc. all require more varieties of hip movement. To get more hip extension in your life, you can add some restorative exercises like standing apanasana, lunges (lots of lunges!) and go walk (not on a treadmill). That way, you don't lose your capacity to move those joints to their full capacity, and you will have loaded the tissues in more diverse ways.
You can strain or tear one or more of your hip flexors when you make sudden movements such as changing directions while running or kicking. Sports and athletic activities where this is likely to occur include running, football, soccer, martial arts, dancing, and hockey. In everyday life, you can strain a hip flexor when you slip and fall, for example.