However, runners are infamous for imbalances in their hip muscles. The most common weak ones are the hip abductors, the muscles on the side of your butt responsible for moving your leg out away from your body to the side. Lev Kalika, D.C., clinical director of New York Dynamic Neuromuscular Rehabilitation & Physical Therapy, tells SELF that since most runners run, run, and only run, they are constantly training their hip flexors and extensors through a very small range of motion. That can lead the hips to be unstable on the less-frequent occasions when you bring your knee all the way to your chest or thrust your hips forward.
To complete this stretch, take a knee in front of a wall so that the toes of the leg you have raised are pressing against the wall. Place that same hand against the wall. Reach behind you with your other hand and grab your leg that’s sitting on the floor by the ankle, and bend it back towards your body. Hold this position and lunge forward towards the wall to complete the stretch. Hold this stretch for 10 seconds, then repeat on the other side of your body.