Our Mission

We want to empower people to be their greatest self in & out of the water


We believe that truly amazing things happen when people reach their goals—When what starts out as a vision becomes a personal victory. Because from that point on, all future victories feel inevitable. That’s why we want to empower people to be their greatest self in and out of the water.

Our Story

Founded in 2018, GMX7 exists to change the world of swimming by empowering swimmers with the best aquatic resistance training device ever created. GMX7 founder, David McCagg, is a 7-time Gold Medalist, former World Record holder and winner of multiple National Championships.

After retiring from a successful career in Real Estate Development, David decided to reenter the world of swimming. Thinking back to his time training under elite Olympic coaches, he knew his success and the success of others boiled down to one thing: how they trained in the water. Revitalized by this, his passion for the sport was more focused than ever: to forever change how athletes approached training.