new way for myself to lose weight

My friends do something called agressive rollerblading. Its something that I've wanted to try for a while and now for my upcoming birthday, my parents are getting a pair for me^_^ I can't wait to learn all the tricks and lose weight while having fun!:) if anybody out there has any tips for beginners, let me know^_^

Here's what it is
https://www.youtube.com/watch?v=jfPIJx-qMng&feature=youtube_gdata_player