Over at the Primal stand, I took part in a challenge to see how many calories I could burn on a HIIT bike in 20 seconds. To ...

If you don’t have a power meter or are practicing HIIT off the bike, you can use rate of perceived exertion (RPE) to determine your effort level. RPE is how hard you feel you’re working on a ...

To make those 10 minutes count, though, you will have to work hard. High-intensity interval training workouts, or HIIT, which involve bursts of high-intensity effort followed by short rest periods ...