How do you jump in Minecraft pe?

I'm completely stupid. I have Minecraft for the phone and see constantly on TikTok that if the PE (Pocket edition phone halt) on the slime blocks press once on the spring button fly higher umd why is the net with me?

That's a mystery.
On slime blocks you can't jump higher with the jump button.
Unless you have a plugin or something similar

But. You have to activate the jump button exactly when landing ^ - ^

I know exactly what you mean with these TikTok videos, these videos are played backwards, that is, they drop and then you automatically jump very high on the mucus blocks