I've noticed that Daniel and Kelli move their arms to the back at the jumping point of jump squats, and I tend to do the opposite - "pull" myself up with my arms in front. I think it's from my volleyball training because I'm pretty sure that's what we were always told to do to jump high.

I tried it the FB way a couple of times, but it felt weird, so I do it my way. Do you think it matters?