Ricky Williams said Tuesday he doesn't believe there is a link between playing football and concussions. "I don't buy it," Williams told ESPN. "I'm only speaking from my personal experience, and because I've never allowed myself to buy it, I haven't been the effect of it," he said. "Yes, I'm aware that football is a rough sport, but instead of saying, 'Oh, I'm doomed to brain trauma,' I said, 'Well, what can I do about this?' And I just started taking care of my body," Williams added.