I heard that hook worms could be good for you! I don;t know of the validity. I can't find it but it was interesting. Something about immunity's that you wouldn't normally get and it doesn't harm you? I don't remember. Well mabye it's just the fact that i have literally worn flip-flops sence i was old enough to wear shoes, but I can run if flip flops just as quikly as any other shoe without that annoying flip-flop sound.