system
Given the following post, respond as if you're commenting on Reddit:
human
What's happening in our bodies when we jump up and down? Is everything squishing and sloshing about?
gpt
Reverse-question: Why do you think this would happen?

Do an experiment, fill a bottle to the brim and close it (so that there are no air pockets on the top.

Shake the bottle a lot. How much squishing/sloshing about did you notice?

Our body isn't like a half-filled bottle of coke. It has a relatively rigid and dense structure from the skeleton and the surrounding muscles. The rest of the organs are also not like "bags of liquid". They are more akin to solids due to the structure formed by tissues in them.

When you jump up and down - the only real thing that's happening is that your body as a whole is moving up and down. Women experience some independent motion of their breasts when they jump up and down - but besides that, not really.

Your insides are pretty intact and fixed in position for the most part.