When muscles contract they burn up a substance called ATP and break it down into ADP (Yes, this is the Krebs cycle from high school biology coming back to haunt you!) Creatine helps turn the ADP back into ATP, thus renewing the energy source for your muscles. Creatine increases the amount of water stored in the muscle and increases the muscle volume--yes, you will look great in your golf shirt! You will also gain a little weight (5-10 pounds) in about 6 weeks. It WILL make you bigger, but not more skillful or agile.
Vickie and Dr Dave: This information would indicate that the main real gain in using Creatine is from super-charging the ATP cycle which means the muscles get less tired during training which leads to the ability to have a longer workout and consequent gains. The water retention thing in the muscles is of no real benefit.
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