Minutes 6 to 10Heartbeat increases and you're burning up to 6 calories a minute as you pick up the pace. A slight rise in blood pressure is countered by the release of chemicals that expand blood vessels, bringing more blood and oxygen to working muscles.
Minutes 21 to 45Feeling invigorated, you start to relax as your body releases tension, thanks in part to a dose of feel-good chemicals such as endorphins in your brain. As more fat is burned, insulin (which helps store fat) drops--excellent news for anyone battling excess weight or diabetes.
Walk / Exercise