This type of girl should weigh around 90 pounds because it is the perfect description of me! (not that I do weigh 90 pounds)
any part of your body that can move has to do with muscles, so yes
You should have no problem with a belly ring. The piercing goes through the skin on your stomach, not your abdominal muscles. Your abs protect your insides, they'll be safe from your piercing.
There is no specific weight. Ideally you should have toned muscles around your stomach but apart from that anyone can do it.
A belly dance is a dance traditional to the Middle East which is characterized by movement of the abdominal muscles.
Transversus Abdominus & Rectus Abdominus
The intercostal muscles, (muscles between the ribs), contract.
this is an embarriasing answer but you belly button goes in when you wee because your using muscles inside your body to use your urinary track like you should or you could have a breathing in when you pee problem :P Hope i helped! :)
genioglossus, geniohyoid, omohyoid, digastric anterior belly, hyoglossus
Superior belly of omohyoid muscle
you use the upper arm and belly
A muscle has three parts; the origin, insertion and belly.
They practice coordinated movements of the abdominal muscles (done for hundreds of years, by belly dancers for instance).