Meet Your Coaches
Theresa Mavity:
CF L2
BS: Nursing & a Masters in Health Education
Theresa started CrossFit in Nov 2014, reluctantly at first, as she was pursing running as her only form of fitness. A CrossFit gym opened up around the corner from her house and she decided to give it a try. From her very first class, Theresa decided CrossFit was an amazing way to get in shape. The diversity in movements in a workout as well as time domains to get the work done, she fell in love with the CrossFit Methodology.
The military brought the Mavity family to Great Falls as her final assignment before retiring. Here she was met with an extremely friendly community at Great Falls CrossFit. A community so amazing that the Mavity family decided to lay down some roots after retirement. In fact, as of September 2026, Theresa and her husband, Bo, have become the new owners of Great Falls CrossFit.
We strive to provide a gym that feels like home. As nurses we believe we can help more people in the CrossFit gym with lifestyle change than we could inside the healthcare system.
As a nurse in the military, Theresa was a disease manager, focusing on behavior modification regarding nutrition/lifestyle. She holds certificates in both Metabolic Flexibility as well as the CrossFit Nutrition Course. Theresa's other certifications include
Kids CrossFit as well as Coaching the Aging Athlete.