Most people with tight hip flexors from sitting think they have a stretching problem. They don't. They have a sitting problem. You've probably felt it without knowing what it was — that stiffness getting out of your car, the low back ache at the end of a long day, the sense that your hips just don't open the way they used to. Maybe you've tried hip flexor stretches. Maybe they helped for twenty minutes. Maybe you're back to square one by lunch. Here's why: stretching a muscle