Join Moms on the Run National Fitness Director, Olympian Carrie Tollefson, for part 3 of our stretch series. Today’s stretch focuses on our hip flexors, a group of muscles in the area where the thighs meet the torso. Tight hip flexors can cause hip and lower back pain, especially in runners. And because of the role that they play in lifting the legs, tight hips can interfere with a runner’s progress. Extended periods sitting at a desk or in a car can also contribute to tightness in the hip flexors. Grab your mat or our final stretch!