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!
A thorough history and physical examination is a good start when sorting out symptoms. X-rays will attest to specific bony/cartilage changes but x-rays don't always correlate with the pain. It is possible to have little pain and much damage on the x-rays or visa versa. It is important to treat the patient, not the x-rays alone. Secondly, x-rays of the back can reveal degeneration of the discs or small joints in the spine but the person does well. Contrary, the back may look degenerative and because of the subsequent bone spurring and symptoms as arthritis progresses, it is important to obtain an MRI to confirm nerve impingements that are suspected. X-rays alone will not show nerve impingement. As you can see, it is important to undergo the history and physical examination and tests that can confirm your diagnosis before treatment begins.
How to do it: Put a 20- to 36-inch box behind you. With your feet hip-width apart, lift your leg and place the instep of your rear foot on the bench. Lower your hips toward the floor so your rear knee comes close to the floor, keeping your back straight. As you descend, make sure you don’t bend the torso excessively forward and your front knee does not pass your front toes. Pause when your rear knee is close to the floor and your front quad is parallel with the floor, then drive through your front heel to return to the start position. Repeat this movement, alternating sides each time.
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.