These training styles are all good, if you know what in the heck you're doing. Most people don't. That includes you. Check out the list.
You think Paleo man was concerned about staying in his "fat burning zone"? He might've had a uni-brow, but he wasn't that stupid.
Everyone hates cardio. Here's how to choose the right type, intensity, frequency, and duration to get into prize-worthy condition.