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Popular in Cardio

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

Boost Yout Heart Rate and Calorie Burn In Only 4 Moves

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

The Hardcore Bodyweight Workout You Can Do In Under 5 Minutes

Get a killer workout crazy quick with Tabata.

A Little Running Gives You A Big Health Boost, Says New Meta-Study

Discouraged you can "only" run a mile or two? Read this now.

Cardio Fat-Blaster

5 equipment-free moves to kick your body into fat-burning mode, fast.

8 Ways to Make Your Cardio Workout Harder (Not Longer)

Try these trainer tricks for more burn in less time.

I Ran All 6 of the World Marathon Majors In 3 Years

From London to New York City to Tokyo, running helped me travel the world--and learn a ton about fitness and tenacity.

How to Burn More Calories Outside the Gym

Transform any outdoor space into the ultimate fat-burning zone with this killer cardio and strength routine.

10 Lessons I Learned from Running 10 Marathons

Marathons can teach you a lot--about running and about life.

Shave a Minute Off Your Run

On the anniversary of the 4-minute mile being broken, set a personal record at your next race with these strategies.

The Ultimate Guide to Running With Your Dog

Four-legged friends can be great running buddies. Read up on the essentials to keep them healthy and happy on the road.

I'm a Slow Runner, and That's Fine With Me

How one writer learned discovered the benefits to letting go of competition.

5 Dance-Inspired Workout Classes We Love

Firm up while getting down at these new workout studios that have us feeling footloose.

How to Run Commute to Work

Pro: It makes you feel like a badass. Con: Two words--sink baths.

13 Marathon Essentials Every Runner Should Own

In honor of the NYC Marathon, we rounded up our must-have gear that will help you look stylish from the moment you start to the second you finish.

5 Must-Try Cycling Trends

Innovative gear and fun new cycling routines that will make you a lean, mean fitness machine.

6 Tips For a More Intense Cardio Workout

Incorporate these six tips to get more out of every heart-pumping sweat session

11 Science-Backed Reasons Running Is Really Good for You

No, it won't destroy your knees. Yes, runner's high is an actual thing.

6 Rules for Running Faster

The smartest ways to increase your speed whether you're racing or just running for fun.

Why Half Marathons Are Better Than Full Marathons

They're doable, you'll feel accomplished, and you don't have to give up your entire social life to train.

Become a Better Runner Without Running

Now's the time to prep for spring races! Boost speed, build endurance, and stay injury-free with these 7 exercises.

The Secret to Running Your Fastest Race Yet

Train your body to start slow so you can finish faster (and happier!).