| Marx Running & Fitness is a running specialty store located in Acton, MA with an outlet location in Lowell, MA. Please note that our Lowell Store is currently closed until 2/12/15 for scheduled maintenance. We do custom gait analysis, sell running & walking shoes, exercise apparel, nutrition, and injury rehab and prevention accessories. Whether you are training for your first 5k or 10k, or are a seasoned veteran at the half marathon or full marathon distance, our expert staff has the knowledge to help you reach your goals. We also work with many customers recovering from lower leg surgery or who have chronic foot/knee pain by finding them the proper footwear that facilitates a full recovery.