As they say, only in America.

If you want to get in great cardio shape, jumping rope is known to be one of the best ways.  It raises your heart rate quickly to burn calories, it strengthens your legs and tightens your core.  But for people who want to jump rope without actually having to use the rope, there’s Cardio Jump.  You hold the two handles in your hands like you would rope handles.  Then you jump over….nothing.  There is no rope under you.  You just pretend.

And this can be yours for only $29.99.  I think I’ll skip it.