Some of the most impressive arms of all time belonged to Mr. John McWilliams. He happened to have a pretty good head start in the arms department thanks to Mother Nature, but what also helped McWilliams stretch the tape was a focus on basic exercises. That, and because he drank plenty of water… since muscle tissue is composed of mostly water, he believed that glugging down that H20 went directly to his arms! While this belief is a little simplistic, drinking enough water IS a good idea (most people don’t get enough and no doubt actually DID contribute to his impressive results.