I didn't know they could refuse permission because of weight...but go you! I could never skydive, I'm terrified of heights.
Sheena, if you want to get a piercing, do it. Believe me, you can't rip out a bellyring. If you do, it will be excessive circumstances, like someone actually doing it for you with a great deal of strength. I actually pull on my 3 all the time when I'm bored and can pull them away from my stomach about half an inch without feeling it.