Does interval training have risks?

Interval training isn't appropriate for everyone. If you have a chronic health condition or haven't been exercising regularly, consult your doctor before trying any type of interval training.

But it may be appropriate for people who are older, less active or overweight. Studies suggest that interval training can be safe and beneficial even in people with heart disease and type 2 diabetes.

Also keep the risk of overuse injury in mind. If you rush into a strenuous workout before your body is ready, you may injure your muscles, tendons or bones. Interval training doesn't have to involve high-impact exercise, ballistic or jumping movements, or heavy weights.

Instead, start slowly. Try doing just one or two higher intensity intervals during each workout at first. If you think you're overdoing it, slow down. As your stamina improves, challenge yourself to vary the pace. You may be surprised by the results.