You hear it all over the place, it's the new craze. Read any magazine, from Muscle and Fiction to Runner's World and you'll see the word intensity. But what exactly is it? Can you define the word intensity?
Some define intensity based on how sweaty you are or how loud you're screaming in the gym. Runners define intensity based on how high the heart rate is. The problem is that neither of these are strong correlates to what intensity actually is. For example, just because your heart… Continue