Our bodies are made up of main types of muscle fiber slow twitch and fast twitch.Nutra Tosterone Slow twitch fibers cannot generate large bursts of power and are utilized during prolonged activity.Our bodies are made up of main types of muscle fiber: slow twitch and fast twitch. Slow twitch fibers cannot generate large bursts of power and are utilized during prolonged activity. They have a high tolerance for endurance exercise but do not have a very high potential for increased growth. Fast twitch fibers on the other hand produce large bursts of power and are utilized during short, explosive movements. They contain a large amount of mitochondria an area in the muscle cell where energy is produced and have the highest potential for increases in both size and strength. By utilizing a rep range of you will tap into these extremely responsive fibers and this will result in the greatest amount of muscle growth and strength gain possible. They have a high tolerance for endurance exercise but do not have a very high potential for increased growth. Fast twitch fibers on the other hand produce large bursts of power and are utilized during short, explosive movements. They contain a large amount of mitochondria an area in the muscle cell where energy is produced and have the highest potential for increases in both size and strength. By utilizing a rep range of you will tap into these extremely responsive fibers and this will result in the greatest amount of muscle growth and strength gain possible. http://hyperglycemiaabout.com/my-observation-about-nutra-tosterone-is-it-a-scam/