tutorial about stroke and usually there's a back-and-forth process until i'm happy and they're happy and when we find that balance. >> hip-hop public health began nearly a decade ago as a partnership between williams and hip-hop pioneer doug e. fresh, also known as the human beat box. ♪ they started with something that made sense for a neurologist, stroke. they say that the program worked. kids were recognizing symptoms and even saving lives. ♪ call 911 >> that's when i said to myself, if it can do this within stroke, then potentially other content areas. >> this video is about exercise followed by a set of beats. breathe before the beats are up, you're exercising too hard. don't breathe at all, you're not exerting enough. take one breath. you're at the ideal level. this is a complex concept called