There's impressive, and then there's "several thousand martial artists performing a highly-coordinated kata at the same time" impressive. This video was taken in 2014 by Gissel Elizabeth Reyes at the Shaolin Tagou Wushu School (don't let the name fool you, it was founded in the '80s) and it showcases the combination of coordination, physical discipline, and fighting techniques taught at the academy.
Also might be handy to watch this video to help mentally prepare for when the Fire Nation attacks:
The academy is one of (if not THE) largest schools of its kind in the world, and before the comments fill up with MMA/Jiu-Jitsu/Armbar fans who are ready to point out how this isn't "real" fighting, just remember that without schools like this we don't get cool fight scenes in movies, tv shows, and videogames. Here's a short segment from National Geographic's documentary on the school: