Honestly glass is lava is not the best warmup games, shouldn't players be encouraged to use the glass many times?
A fun game i tried a week ago:
Let the players place 3 disc cones each wherever they want in the court, then you play a normal tie break, but the catch is that if the opponents hit one of your cones the point ends and they gain five points.
To make the game more chaotic, my coach used to switch sides everytime, so we couldn't be too harsh on our placements.
It's a fun game, and it forces you to think about the direction of your shots, and which balls are easier and harder for you
Yes you're right. Glass is lava is not my favourite option but it can get quite funny.
Nice idea with the cones. This is probably something for the end of a session and not the beginning, as you're playing with serve and everything. What do you mean with "coach used to switch sides every time"?
So, players are usually a bit too harsh with their placements (ex: placing the cones just under the net or in the corners). To compensate this, instead of prohibiting certain spots, you make them switch sides, so that they have to hit the cones they placed themselves.
This forces to make smart placements that are not impossible to hit.
Edit: obv you shouldn't switch sides everytime, make them also play with their placements
