Class FitSugar

Check out this killer HIIT workout where you do four exercises for four rounds with Brett Hoebel.

Empower your body and mind with this 30-minute yoga-barre hybrid workout from Corinne Wainer, CAO and co-founder of SHAKTIBARRE.

Get ready to de-stress with this relaxing yoga series with Adriene Mishler from Yoga With Adriene.

Fitness trainer Amy Rosoff Davis, who has helped celebrities like Selena Gomez get in top shape, is in the studio to help you get sculpted arms and a toned core.

It can be hard to slow down -- especially when it comes to workouts. Juliet Kaska shows how to give your body the restorative love it deserves.

Burn up your abs and arms in just 10 minutes with this barre workout from Brandon Goodman of FlyBarre.

Get ready for six-pack abs and perfect posture workout with Jason Wimberly, founder of The Wall.

Lift and tone your booty with this 15-minute workout from Anna Victoria, creator of the Body Love app.

No trainer? No gym? No problem. You can get fit and build strength with this all-new plan designed for beginners, but modifications for all fitness levels are provided in every workout.

This 15-minute workout from celebrity trainer Astrid Swan will tone your abs and booty, but also leave you feeling extra sassy!

Celebrity trainer Patrick Murphy shares this 15-minute workout that gets the cast of Baywatch beach ready!

Tone your legs in 10 minutes with Barre Hop, a barre-based workout infused with hip-hop movements and music, created by Ericka Taylor.

Check out this booty-sculpting workout with Jennifer Lopez's trainer, David Kirsch.

Grab a pair of free weights and get ready to torch calories with this challenging at-home cardio workout from Danielle Pascente.

We love Pilates and HIIT, so Cassey Ho put the two workouts together to create an ab-centric "PIIT" workout.

Shake it out, shake it off and shake away stress with this high-intensity cardio workout! Christa DiPaolo gets your blood pumping with cardio exercises, leading up to a core-centric cooldown that gradually brings it back down.

Marnie Alton, fitness expert and founder of the M/Body Exercise Technique and Studio, teaches this quick, 10-minute routine just for POPSUGAR!

Get ready to get breathless with this HIIT workout from group fitness instructor Raneir Pollard.

This calorie-torching cardio and sculpting workout is one of our hardest ever, but Equinox Tabata instructor Raneir Pollard's amazing energy will inspire you to fight for it.

Get ready to work your abs, legs and butt with this toning and sculpting workout from Selena Gomez's trainer, Amy Rosoff Davis.

Get ready for a focused Pilates workout with WundaBar Pilates creator Amy Jordan that will tighten your entire body while strengthening your core.

It's time to the give up crunches to do some ab exercises that really work.

There is no messing around in this 30-minute workout with Allie Cohen -- except for the short dance break to shake things up before the final circuit.

Get ready to sweat with Astrid Swan as she takes you through this bikini circuit workout.

Get ready to work your entire body in 30 minutes! In our Two-Week Tone-Up Plan, we thought it was time to add some hand weights into the mix to help build lean muscle.