Yoga Push Ups
For the Around the World exercise, hang from monkey bars or a pull up bar. From a dead hang and with your legs as straight as possible, lift your legs to one side up and around your head level until they return back to the starting position. From there, change directions and lift your legs creating another circle in the opposite direction. Continue lifting your legs "Around the World" until you can no longer complete a rep, then rest.
This exercise focuses on your core. Your lower abs and obliques are used to lift the bottom half of the circle. Then, you use your upper abs and obliques to carry out the motion of the upper half of the circle.