In only three minutes. It’s all brief, and very intense. Remember: endurance and intensity are inversely related. The more intense, the briefer. Watch this and you’ll soon understand why so many fool themselves about “working out” doing slow, boring “cardio.” Very few of them could handle a minute of this, much less three or more. Right here is real cardio, modeled after the way nature intended you to get it: all in, but briefly. That’s from Chris, and the facility is Mountain Athlete in Jackson, Wyoming.