I do 3 minutes of sideway jumps over my abdoboard with my legs together at all times. Then a one minute break, and then 3 more minutes of it. I do it for 4 rounds. It really does get you fit!

As I take off and land on the balls of my feet I think it would help your calves, but I'm not really sure. Does someone fancy doing them and let me know what it affects?

(My abdoboard is about 40cm high)