Never, ever let go of your brakes close to the ground.
See this discussion, make sure your harness is well adjusted before taking off. This is especially important for us, as we never really have enough height to safely release the brakes.
http://www.beyondextreme.co.uk/forum/re ... 75&t=34575
http://www.beyondextreme.co.uk/forum/re ... 75&t=34575