Phases of an X3 Set When working out with X3, there are two distinct phases to each movement. Phase 1: At the start of a set, users work toward fatigue in the strong range, where high forces promote growth of the myofibrils. Here, you are creating structural fatigue of the muscle but are not yet out of ATP/Glycogen/Creatinephosphate (ATPGCp). This phase is where the most power is built, as the structure of the cell has much more influence on absolute/explosive strength. More tissue is potentiated (called to action), providing the neurological benefit of explosiveness from a different
...more