Mutant phase is directly after bionic phase. Now that we have accomplished the recruitment of explosive muscles and quick twitch fibers , we transition to non resistant ball carrying drills. This is the period when a running style is created. Ball carriers will learn to use all the movement patterns they have accumulated at game speed. Repetition will fuel confidence in new movement patterns and mutate into a style. Also, during this phase RB's will master all aspects of the running back position. Other positions such as zone read QB's , receivers , DB's and kick returners will learn how to dominate with the ball in their hand.