Stemlerfit Double Unders PX

iPhone version: Learn to master that cool but tricky skipping skill, the double-under. This is where the rope passes twice under the feet for every jump. A fantastic cardiovascular exercise that also enhances your coordination and balance. Find out more about the Stemlerfit series of functional fitness guides.

For a video preview of this app, go to
https://www.youtube.com/watch?v=h6tK3DkhHXE