any part of your body that can move has to do with muscles, so yes
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.
genioglossus, geniohyoid, omohyoid, digastric anterior belly, hyoglossus
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).
the frontal belly of the epicranius
The treadmill gives you abs since you'll be burning the belly fat in your stomach but you'll have to do abdominal workouts. It does not give you muscles, to gain muscles you'll have to lift weights.
You have to lose belly fat before you get a six pack. This is the only way that the abdominal muscles will be toned to form a six pack.
The infrahyoid muscles, such as the sternohyoid, omohyoid, thyrohyoid, and sternothyroid muscles, are responsible for depressing the hyoid bone. These muscles help to lower the hyoid bone during swallowing and speaking.
Crunches by themselves will not burn off belly fat. They will however strengthen and tone the muscles. A much more efficient way of burning off belly fat is diet and whole body exercise.
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.