Have you heard the buzz about high-intensity interval training (aka HIIT) lately? It’s a simple—albeit sweat-inducing concept: You do intervals of super-high intensity for maximum calorie burn. And the upside of working your tail off intensity-wise? You can significantly cut your workout time. Woohoo!
Previously, researchers thought that to gain benefit from HIIT, you had to be working hard, like all-out, wanna puke hard. But researchers now believe that it doesn’t have to be 95 percent effort to reap rewards; less intense exercise intervals are beneficial, too. The reasons are unclear exactly why, but scientists believe that HIIT stimulates many of the same cellular pathways that are responsible for the beneficial effects we associate with endurance training.