Head over to the Tea Time forums and read up on what you can do to prevent RSI. It's really important to take frequent brakes and stretch. It's so easy to get caught up in a shot and work for hours without blinking! You have to take breaks!
The above link will also give you a handy pdf link the whole thing.
This trailer continues the tradition of being meh and the movie ends up being great. So weird. Not a fan though of the cartoony character designs yet super real environment mashup. Bit odd. But both look great separately.