What is interval training, and how could walking intervals boost your health and fitness? - From the benefits to who can do it and how to get the most out of it for your body, here’s our expert ...

What Is It: Speedplay is a 60-minute high-intensity interval training class that combines running, rowing and floor exercises to burn up to 900 calories per session. Who Tried It: Gabrielle Olya ...

We asked experts about the benefits of interval training and who can do it, then explored a study of how walking intervals can boost your health and fitness.