Holland also suggests doing strength work in different planes of motion to keep all the muscles in and around your hip flexors, especially your glutes, firing correctly.“You can’t have good hip flexion if your glutes are tight or weak,” Nurse says, “so it’s super important that you’re always stretching and strengthening the front of your hip flexor and the back, which are the glute muscles.”
The hips are the cornerstone of every runner’s body. Comprising an array of muscle groups—from the all-powerful glutes to the smaller hip flexors and adductors—your hips propel every stride, stabilize the thighs, and (quite literally) keep the knee on the right track, physical therapist John Sauer, D.P.T., O.C.S., an endurance program manager with Athletico Physical Therapy, tells SELF.
Mobility and exercise (e.g., walking, running, stretching, etc.) help to more evenly distribute the forces of impact and weight through this ball-and-socket joint. As people age or find themselves living a more sedentary lifestyle from (e.g., sitting a lot at work), the wear and tear of the hip joint is less distributed, taking place in a smaller area within the socket.
Grade III (severe): A complete tear in your muscle that causes severe pain and swelling and you can't bear weight on that leg, making it difficult to walk. You've also lost more than 50 percent of your muscle function. These injuries are less common and may need surgery to repair the torn muscle. They can take several months or more to completely heal.