You will :

1. Lose 600-1000 calories in an hour.
2. Fit fun into a busy schedule.
3. Reduce stress, clear your mind.
4. Burn fat, maintain healthy weight.
5. Build endurance & coordination.
6. Increase circulation & flexibility.
7. Strengthen your heart & lungs.
8. Tone muscles.
9. Practice dancing, gain confidence on the floor.
10. Explore your creative side, express yourself through movement.

Feel free to add more ...

Wow these are some great points. I will try to add a few:

1. It's addictive- Keeps you coming back because it so much fun
2. Works for all ages and adapts to all fitness levels
3. The times goes by fast and don't feel like a workout until next morning LOL.
4.. Makes you excited and happy. The music and atomophere puts you in a good mood.
5. See amazing results within 30 days.
6. Zumba is well-rounded. It focus on all parts of your body.
7. Zumba is one big party!!!