system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what happens when we jump?

So energy from our feet makes us rise and stay up for a few seconds?
Why does gravity pull us down if it allowed us to float in the first place?
gpt
Gravity is a constant force. On Earth, it always exerts the same amount of "effort." When you jump, your muscles are exerting a much greater effort. When you add together the force of gravity and the force of your jump, the net result is an upwards force that accelerates you up.

Once your feet are off the floor, you stop pushing up, so the only thing left is gravity. Gravity is still pulling you down at the exact same rate it always was. As you move up, gravity accelerates you downward, eating away at your upwards velocity until you stop, but only for an instant. Then, it continues pulling you down (as it always has been) and you fall.

Gravity did not "allow" anything. You have been fighting it every moment of your existence.

Also, something funny that happens when you jump: technically, because of how gravity and forces work, the Earth momentarily fell "up" from *you*, before falling back as it was attracted to your gravity. Sure, it's too small to see, but it did actually happen.