Exactly How Much Cardio Should You Be Doing? New research says not as much as you’d think
Cardio queens, adrenaline junkies, runners with a constant high and cardioholics, please stand up! (Then sit down. And then plyo jump back up. Repeat down and up until your heart rate is in zone 4.) New research is afoot in the great cardio debate and — I’m going to break this to you gently, so …