We constantly looking for more challenge in our trainings. Because that's how we grow. That's how you learn your first pull-up, handstand, or whatever used to be impossible for the old you. You train at next level challenges, so you can stay at that level after as a norm. That's how weighted vest works. Weighted training makes your body get used to the extra gravity, so you can permanently feel lighter thereafter. The gravity doesn't change a bit, you've have become stronger.