Hey all you Belly people, i hope you are warming up before you are dancing.
Here are some videos that will show you various warm ups and strength exercises. I one day plan on creating a video of my warm up routines but untill then here are some youtube friendly videos.

Warm up Routine

Warm up routine
Warm up continues

Warm Up- reach stretch

Same lady- she has more videos but they do not belong in this thread.
Core Strength
Belly Strength (core2)
Lunges - hips stretch
Leg Circles
Arm Work
Leg Strength for Level Changes


Great modern Dance warm ups ( these are very good.)
single video look on side for related videos (same instructor)