Creatine is a major storage form of fuel that drives muscular contractions when you’re lifting heavy weights. But, once you use up creatine stores, they have to be regenerated or further contractions can’t take place. It’s easy to understand, then, that if you can hyper-regenerate creatine stores in your muscles, you’ll be able to rest less between sets, get more power out of each set, get more reps from each set and, thus, stimulate more muscle fibers during each set. That leads to more lean muscle growth!