Pack on muscle mass like no other workout. The Mi40X or Mi40 Extreme workout program takes muscle building to whole new level. The workout applies a unique and scientifically proven technique called CEP for short which is the key to rapid increases in muscle mass in a short time frame. CEP stands for cell expansion protocol. A study was conducted of two groups of 20 to 30 year males, one group used a traditional workout regime and the other used the CEP training technique. The results showed that the group utilizing the Mi40x CEP training techniques made superior gains in both muscle size and reduction in body fat levels.