<iframe src="https://player.vimeo.com/video/271794232?background=1" width="640" height="360" frameborder="0" allowfullscreen></iframe>
Find two paper plates or two things that slide on the carpet. Get in a push-up position with your hands and toes on the ground and one foot on each plate. Alternate driving knees into your chest/sliding plates in and out alternating.