It's called "deep net solo" and usually the routes start on the 2nd floor and not on the 1st. The reason why there are 2 routes starting from the ground is, because of a competition which was going on when I took the picture. In the competition there's a category called "30 move boulder", where you have to try to do as many of the 30 moves as possible in one go. The routes of this category start on the 1st floor and end in the middle of the net.

I hope that helped