Just if somebody else has some children and wants to let them try foil surfing in controlled envirnoment.
My son (8) wanted to have a go, so i setup a simple pulley. He started on his knees, and now he is OK standing (sometimes).
I recommend a Helmet as you get close to the peer as you see in the video. And do it somewhere where no one else is swimming - ropes and swimmers don't go well.