• Make Every Gym Moment, Minute And Movement Matter. Whether You’Re Racing The Clock, Gritting Through The Last Set Or Staying Steady Through Heaves And Holds, The Mc Trainer 3 Can Help You Hit Your Fitness Intent. Breathable Mesh In The Upper Turns This Trainer Into A Shoe You Can Wear Anywhere. And A Flat Base Brings A Level Of Stability To The Motions You Love Most.