I'm 21 so that would mean 70% of my MHR would be 140 right? but that means I'm not even jogging, it means I walk a little faster then normal.. it seems that my idea of cardio should be at least a light jog.. I could be wrong..) so basically is my cardio to intense to lose fat (around 80-85% most of the time) and could that higher intensity cardio interfere with muscle growth? thanks in advance for the input guys!