Regardless of whether you choose to jog or run, always begin your workout with a 5- to 10-minute warm-up such as walking or light jogging. This helps to warm up your muscles and slowly increase your heart rate and blood circulation. Likewise, end your workout with a 5- to 10-minute cool-down such as a walk or light jog to slowly return your body to the pre-exercise state. If you are new to exercising or have chronic conditions and are considering more intensive exercise such as longer jogs or faster runs, discuss your plans with your doctor first.