Energy. It builds up. Then it wants release. I guess we all know this. Some (SFW) examples.
Example 1:
See specifically number 2 - when Carlos Alcaraz gets to the net and his weight is on the wrong foot, but still manages to get the ball, then, well, wow. You can FEEL the build up, in the crowd, in the stadium. Then, release. Impossible to stay in your seat.
Example 2:
Again the build-up of tension, then, it hungers for release. One must stand up!
Bonus:
The point at 2:03. Crazy. Tennis is crazy right now. The level at which they are playing, since Federer, incredible. It feels like they’re really pushing the boundaries of what’s possible. And now this dude.