Before Nike employed Aesop Rock and LCD Soundsystem to kick off its Original Run series on iTunes, Los Angeles native Steve Boyette, aka DJ Steveboy
, was raising pulses with his own workout mixes. "My wife is a runner, former aerobics teacher and hardcore marathon trainer, and for years I've made run mixes for her," Boyette tells us. As an afterthought, Boyette asked his wife if she thought other athletes might dig his mixes. He's been downloaded more than 3 million times since. Along with new weekly hourlong sets, his online archive brims with sweat-inducing blends of electronic and funk all for free. After all, it's your waistline you want to slim down, not your wallet.