First, get your half of a coconut.  Yes, at my house we still use this machine.
Sit on the machine. Move the coconut downwards slowly and pick up the pace.

Your machine should look like this (source: http://bluesriders.blogspot.com) I forgot to take the whole pic of the equipment. This is the closest I get to own a pony!

 

After a few stride, the outcome is obvious

Woman at work