Check out Women's Health's FitGIF Friday every week for fun and challenging new moves to make your sweat sesh really count. This week's exercise is courtesy of Furthermore:

Slide-through: Sliding discs are perhaps the most underrated pieces of fitness equipment. Case in point: Here, they're used to build strength in your triceps and abs, all while testing your balance and stability. For more ways to add sliding discs to your workouts, check out this page on Furthermore. 

(Get more legs-sculpting workouts from Women's Health's Look Better Naked DVD.)

slide through
Furthermore

How to: Sit with your legs extended on the floor in front of you, each heel on a disc, palms on the floor beside hips. Lift hips. Slide your feet forward as you raise hips until you’re in a reverse plank, with your body aligned from shoulders to heels. Reverse the motion, sliding feet back until you’re in a pike position. Repeat for one minute.