Marx Running & Fitness Center in Acton offers an extensive selection of distance, track and cross country running equipment. In addition to over 120 shoe models, Marx offers spikes, hydration systems, uniforms, energy packs and more. The staff of running specialists use an on-site treadmill to personally analyze the stride of the customer so they can provide expert advice on selecting the correct running shoe. Marx Running & Fitness's staff of certified running coaches offer both individualized and group training for high school runners and adults. Customers can shop both in store and online.