All goalkeepers hate the lower hand throw, because it is almost every time a great surprise when it arrives.
In the lower hand throw it is important that the last step is very long.
The upper body is bend over and the ball is sent away.
Take care that the shot is not some kind of bowling shot.
The ball must be sent away with a powerful flick in the wrist.
When the technique is in order the shot can be pulled upwards against the goal.