Howcast - Learn how to do yonkyo from the instructors at The New York Aikikai in this Howcast aikido video.

Howcast - Learn how to do sankyo from the instructors at The New York Aikikai in this Howcast aikido video.

Howcast - Learn how to do aiki otoshi from the instructors at The New York Aikikai in this Howcast aikido video.

Howcast - Learn how to do koshi nage from the instructors at The New York Aikikai in this Howcast aikido video.

Howcast - Learn how to do shihonage from the instructors at The New York Aikikai in this Howcast aikido video.

Howcast - Learn how to do the net lift from New York City Badminton in this Howcast video. Thumbnail: badminton simple féminin by alainalele/Flickr

Howcast - Learn how to do side bends, an advanced Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the leg pull-up, an advanced Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do hip circles, an advanced Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the side kick hot potato, an advanced Pilates Mat move, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the side kick rond de jambe, an advanced Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast video.

Howcast - Learn how to do the full corkscrew, an advanced Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn to do the serratus push-ups, an intermediate Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do teaser two, an intermediate Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the shoulder bridge, a Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do side kick beats, a Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the side kick bicycle, a Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do swimming, the Pilates Mat exercise, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the wall arm Pilates Mat exercise from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the up and down side kick Pilates Mat exercise from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the Pilates mat exercise spine stretch forward from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the criss-cross, a Pilates Mat exercise for the abs, from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the double straight leg stretch Pilates Mat ab exercise from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.

Howcast - Learn how to do the single leg circle Pilates Mat exercise from Core Pilates NYC instructor Sarah Ruback in this Howcast workout video.