Kneel with the foam roller in front of you. Lay down with the foam roller directly under your hip flexors. Your legs should be extended and your forearms directly on the ground for support.

Hip flexor stretches help improve your posture and fight off lower back, hip, and knee pain. Using a foam roller on your upper legs may help relax your hip flexors and increase flexibility.

If your hip flexors perpetually feel like two rubber ... Before you start, learn how to do self-massage and check out the best foam roller moves. Then move on to these hip-opening stretches.