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High-Intensity Interval Training

The Intense Tabata Workout for a Total-Body Burnout

Bodyweight moves that are anything but basic and guaranteed to bring the burn

The Tabata Workout with Exercises You've *Never* Seen Before

Trainer Kaisa Keranen's latest Tabata workout will blow your mind.

This Total-Body HIIT Workout Will Get You Sweating In Under 5 Minutes

It will be the longest, but most #worthit 5 minutes of your life

Intense At-Home Exercises That Boost Your Heart Rate and Calorie Burn

Trainer Kaisa Keranen shows you how to break a sweat, fast.

Why Do We Love Torturously Tough Workouts So Much?

These fitness classes push your brain and body to the max.

Sculpt Your Legs and Abs In 4 Minutes Flat

Four moves, four minutes, and all your effort

A HIIT Workout Like You've Never Done Before

And you thought regular HIIT was hard

This Is the Best Way to Exercise to Boost Your Energy

Too much exercise will wear you down and sap your energy, but too little makes you weak and tired. Here's what you should be doing at the gym to skyrocket your energy levels.

How Does Meditation Fit In with HIIT?

It's no longer one or the other—now you can get your dose of zen along with a heart rate-boosting sweat session.

Work Out Like An Australian with This Total-Body Toning Circuit

Fast and fun: that's the workout mantra from Down Under.

Can You Really Work Out for 1 Minute Instead of 45?! New Study Says Yes

The secret to shaping up involves more effort than time

This Could Be the Secret to Your Best HIIT Workout Ever

Your HIIT workout may be missing a key element, and it has nothing to do with how much you sweat.

4 Fat-Burning Tabata Moves Carrie Underwood Swears By

We've got an exclusive Tabata workout from personal trainer Erin Oprea's new book, <em>The 4x4 Diet.</em>

The Downside to High-Intensity Sprint Training

A new study says explosive sprint training can cause serious damage, putting you at risk for certain diseases and even cancer.

Your 7-Minute Fat-Blasting HIIT Workout

No time? With this quickie workout, there's no excuse!

30-Day Challenge: Heart Rate-Boosting HIIT Workout

Go ahead, cheat on your regular workout.

The 30-Minute HIIT Workout to Beat Your Winter Slump

A quick workout that packs the punch you need to get out of your blistery weather-induced rut–and see major results!

Make Your Cardio Workouts Harder (Not Longer)

Try these trainer tricks for more burn in less time.

The No. 1 Reason Runners Should Be Cross Training on a Bicycle

Science says going for a spin might actually make you run even faster.

The 20-Minute Workout to Help You Get Fit, Get Toned, and Get On with Your Day

These big-bang moves target every muscle for an efficient firm-and-burn.

Jillian Michaels' Fat-Melting Bodyweight Workout

Get Jillian strong with body-transforming moves you can do right at home (Michaels swears by 'em!).