Jogging isn’t slow running. It’s an intentional heel strike. In the late 1960's, New Zealand running coach Arthur Lydiard invented jogging as a training tool to get people in shape to run. And when Nike founder Bill Bowerman learned this technique from him and brought it to the US in the 70's, it took off. Now, it’s taken on a life of its own as cardio for the sake of fitness has become popular. Sure, you can jog fast and be a competitive endurance athlete. But good luck doing that without thick