1. Work up to a max height box jump

 

2. Fifteen minutes to get as high up the ladder as you can of:

5 Box Jumps
5 Double Unders
10 Box Jumps
10 Double Unders
15 Box Jumps
15 Double Unders
20 Box Jumps
20 Double Unders
and so on….

* Use 24/20″ box