Well done, well mixed, although I'm not hearing the old lady doing Zumba part quite yet. :P She sounds like a badass from what I can hear. If there's anything I can call your piece, it's dynamic, evolving. That I can appreciate.
Only one flaw. 1:06-1:09, listen carefully to the timpani in the right channel. It dips out at one point completely. Kinda made my ear twitch and took me out of the immersion for a second. Also sounds a bit distorted around there.