In other words... your BASE HEART RATE is the work that your heart does when you wake up in the morning, without doing exercise. When you work out your heart rate goes up from your BASE HEART RATE to a accelerated state on where your heart works faster and burns more energy, Now the work of Cotto"s trainer is to adapt Cotto's body to recuperate from an accelerated state (tired) to he"s BASE HEART RATE (rested) in or less than the minute given between rounds so he can have stamina to fight Margarito!