How do you increase/decrease player size ingame with particles and / or triggers?

Hey guys!
I’m working on the rolling blueprint at the moment and I would like to know if there is a way to increase and decrease the player size in game when the player collides with particles or trigger boxes that I set? Any help + pictures will be really appreciated. Thanks in advance.

Ditto! Been doing searches but come up empty handed… also need to know how to prevent players from floating when they shrink.