If you have diabetes, injecting bursts of high intensity into your workouts -- known as interval training -- helps lower your blood glucose level, improve cardiovascular health, and build stamina. Next time you're walking on a treadmill, try adding short bursts of speed to your workout. On the elliptical machine? Crank up the resistance. Out on a walk? Alternate between a fast pace and slow pace. Start with short 15- to 30-second bursts of intensity and gradually working up to longer intervals of a minute or two.