In squash, after throwing the ball in the air, the serving player becomes off balance and makes no attempt to strike the ball. Is this a fault?
As per section 4.3 under the rules of service in squash as laid out by US Squash, the serve is not counted as a fault if the server makes no attempt to strike the ball.
4.3 To serve, a player shall release the ball from either a hand or the racket and then strike it. Should the player make no attempt to strike it after that release, the player shall release the ball again for that service.