Charlie, If you want to learn something that allows you to take people down, learn how to use weapons. Arts like Eskrima / Kali and Indonesian Silat are battle tested martial arts which show you how to take down guys a few stone heavier than you. Only an idiot goes to a fight believing he defend himself with just the weapons God gave him at the end of his wrists.
Otherwise, all the 'open handed' arts are great for exercise, fun and overall conditioning, providing the instructor is good!!



