If you’re a runner, you may warm up with some dynamic hamstring stretches and reward your glutes and quads with a little foam rolling action when you’re done. But how often are you stretching your hip flexors? Probably not very often, right? Despite being a core group of muscles used when running, the hip flexors—a cluster of muscles in the front part of the hip—are a part of the body many people neglect to stretch. When they get tight, the stiffness can prevent you from running your best and can contribute to lower back pain. How can you prevent it? The hip flexor exercises rounded up here are the ones physical therapists recommend most to runners as well as people who cycle and row. How to know if you have tight hip flexors—and what happens if you ignore them “Hip flexors refer to a group of muscles around the hip joint that are responsible for lifting the leg or ‘flexing’ the hip,” says Duke Hasson, MD, an orthopedic surgeon at DISC Sports & Spine Center …