John Wolf is Onnit's Chief Fitness Officer, and an expert in unconventional training methods such as kettlebell, steel club, and suspension training. With 15-plus years of experience in the fitness industry, he has worked with rehab clients and athletes of all levels. He moves like Spider Man and can deadlift more than 500 pounds any day of the week.
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.

The main work of your hip flexors is to bring your knee toward your chest and to bend at the waist. Symptoms associated with a hip flexor strain can range from mild to severe and can impact your mobility. If you don’t rest and seek treatment, your hip flexor strain symptoms could get worse. But there are many at-home activities and remedies that can help reduce hip flexor strain symptoms.
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