BAck roll is one of the first tricks you learn in kitesurfing. It is important because it is the basis for alot of other advanced moves. Start with the kite at apx 11 in the sky with both hands in the centre of the bar.Be going along at a moderate speed then throw your head to your left shoulder while trying to push the nose of the board over your shoulder and into the wind. Commitment is he key as since your not jumping high anyway then enen if you crash your not going to get slammed. This is the best discription i can give with out visually showing the action on land.