The hip flexor is found at the front of your hip bone. For the exercise, start by kneeling with your hands on the floor, in front of a couch. Place the top of your feet on the couch behind you and bring the other one forward. This brings you to a half-kneeling position. You might feel a stretch in the front of the hip and the back of the thigh. Hold this position for 45 to 60 seconds.