YOU KNOW YOU need muscle... and you need to burn calories. Everyone needs more strength, too—and we can all use a little more athleticism. But you don’t have hours upon hours upon hours to chase all ...

High-intensity interval training has transformed the landscape of modern fitness, offering scientifically proven results in condensed time frames. This comprehensive seven-day program combines intense ...

Transform your home workouts with this ultimate full-body HIIT and dumbbell strength routine. Step-by-step exercises for ...

If you have less than 20 minutes, you have all the time you need to get toned from head to toe with this total body dumbbell ...

We’ve created the ultimate HIIT workout with dumbbells to build full-body muscle in seven moves. These exercises should push your limits and spike your heart rate, sculpting muscles from head to toe ...

High-intensity interval training will keep you moving toward your health goals this holiday season — without requiring a ton ...

HIIT (high-intensity interval training) routines are always tough, but outdoor HIIT running workouts are on another level. "Performing high intensity intervals will require you to dig deep and find ...

If you are someone who loves to have fun, workout with your friends, get your endorphins pumping and push your body to limits you never knew existed, then Sweat with Amanda Ngonyama is a HIIT class ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. For more information on Nucleus Central Core ...

Alex Hutchinson is a National Magazine Award-winning journalist and Outside’s Sweat Science columnist, covering the latest research on endurance and outdoor sports. New perk: Easily find new routes ...