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Your one-stop-shop for all things running and fitness

Marx Running & Fitness is a running specialty store located in Acton and Lowell, MA . We do a 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 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.

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Custom Gait Analysis

At Marx Running & Fitness, we evaluate your gait to determine what type of shoe will be best for your individual stride. Our fit process is based on the mantra “Function, Fit, Fashion”. We analyze your gait to determine the function of the shoe you’ll need, then have you try on several pairs across different brands to find the optimal fit, and finally, if all things are equal, color or style may factor into the decision. In general, there are three primary types of gait that we see: supination or under-pronation, neutral, and over-pronation. Ideally, you want a shoe that keeps you in a neutral position and keeps your lower leg in alignment. This takes stress off of your smaller, stabilization muscles and tendons and reduces the likelihood of injury. Running in the wrong shoe can create instabilities that lead to injury, so it is important that you are evaluated to find a shoe that works for your specific pattern. This is what we do best!


Orange Theory fitness OTF 361 Nemesis

Not only do we perform gait analysis in the store, we can bring it on the road. We at Marx Running have created this mobile gait analysis cart that allows to go into gyms such as Orange Theory and perform a large number of gait analyses without interrupting your workout. We record, analyze, and EDUCATE the members and staff on proper footwear.


At Marx Running and Fitness Center, we understand that not all Running Shoes are built the same; we also realize this can be a really important purchase, since people often look for a specific feel. All models are designed with different functions in mind, so let us know what you’re looking for and we’ll guide you in the right direction.

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