What is the gimmick? Not familiar with this.
There is the website. I think they were originally manufactured for athletes that had knee problems or tore their ACL's but wanted to continue training.
Wow, they look just GREAT haha... :D Is it easier to run with running shoes or with this kangoo-jumps? I would love to try them ;-) Thank you so much!
I bet they're easier on the knees due to the springy action.