Jumping on boxes has become rather popular in some fitness circles. Jumping for fitness has been around for a long time. Jumping onto extremely high boxes or platforms has only recently become a fitness fad of sorts. Unfortunately, it's also led to a number of unpleasant consequences.
But you don't need a really high box to get the benefits of box jumps.
Here is an explanation of why box jumping is good and how to do it safely.
You might also have noticed that box jumps use triple extension. It's all coming together.
Be seeing you.
-gary