MetroFlex Gym: Serious Training, Serious Results. Metroflex Gym of Plano is the training ground of athletes, champion bodybuilders, powerlifters, strongman competitors, and fitness, figure, and bikini athletes. If you are serious about getting the most out of your training you can't afford not to train in this environment. Get help from one of our personal trainers and be on your way to reaching your muscle building or weight loss goals. Join Us TODAY!