Mario Lopez – Shirtless Celebrity Studs
If you want to look like him, you're in luck -- his own series of fitness videos is on YouTube. They use circuit training to give you six-pack abs. In theory, anyway.
He trains a whopping six days a week, and here's his tip for wannabee fit-dudes: "Find something you love to do and fight to improve each day. If you love to play at it, you'll work hard at it."