Question about ABC's family Make it or break it?

Abc family show make it or break it is about gymnastics. Josie loren, Cassie Scerbo, Chelsea Hobbs, and Ayla Kell are in it. i wanted to know if they had stunt doubles or if they did it themselves. Nicole anderson too. I read on a blog of Cassie Scerbos that they had to train hard everyday so idk if that means they do the gymnastics themselves but i wanna know. :) Thanks~Katherine