When it comes to burning a lot of calories in little time, try Tabata.  It's a form of high-intensity interval training (aka HIIT) that alternates between 20 seconds of max training and 10-second rest periods for a total of eight rounds.  These workouts are fast-paced and fun.

This workout is made of two Tabata sets, plus a short warmup and cooldown.  No equipment is necessary, and we keep track of the timing.  So what are you waiting for?  Press play, and get your sweat on.

Looking for a longer workout?  After completing this video, try another 10-minute Tabata workout for 20 minutes of fun!

Celebrate the start of Winter with a little yoga.  This 10-minute flow will make you smile, laugh, and then smile some more!  Mandy Ingber's yoga for happiness will help you open up the heart, appreciate who you are, and find gratitude in everyday life.  With all the fun you're having, you won't even realize that you also just finished a total-body (and mind) workout.  Press play to get a peek at why Mandy's celebrity clients, like Jennifer Aniston, keep coming back for more.

We love Tabata interval workouts.  It's four minutes of high-intensity training, alternating between 20 seconds of max training and a 10-second rest for a total of eight rounds.  These workouts are fast-paced and fun and burn up tons of calories.

In this workout, we bring you two sets of Tabata, plus a little warmup and cooldown.  No equipment is necessary, and we keep track of the timing.  So what are you waiting for?  Press play and get your sweat on.

Get ready to take your workout to the next level with Jessica Alba's CrossFit trainer, Yumi Lee.  This workout is excuse-proof:  you don't need any equipment, and it's only 10 minutes long, but it will definitely get your heart pumping.  No need to be intimidated by CrossFit either:  Yumi provides level-appropriate variations for every move.  Press play and get ready to work!

It's time to prep for your bikini.  And who better to help than Jeanette Jenkins, president of The Hollywood Trainer, where she's worked with heavyweights like Alicia Keys, Pink, and Kelly Rowland.  In this 10-minute, total-body bikini boot camp, Jeanette will have your heart rate up and muscles burning.  Grab a pair of three- to five-pound weights and get ready to work!