Ask a PT Response: "How is your hip doing now? Tingling is more than likely associated with a nerve being compressed or stressed. The femoral nerve or other nerves which branch off from the femoral nerve may be compressed when you are utilizing the foam roller to target your hip flexors. Have you tried adjusting or modifying your your position on the roller (more prone, more lateral, more medial) to see if you continue to experience tingling? If you continue to experience tingling despite the modifications, it may not be a good idea to continue with this exercise as it may result in further injury to your hip. Seeing a PT may be the next step if your hip pain continues to occur with running as the therapist will be able to determine what is contributing to your condition (ie. running mechanics, flexibility issues, etc.)."