In Shirobako episode 16, Ema is caught doing a little dance exercise on the roof.
CrunchyRoll's subtitles call this the 'Angel Dance' exercise. There's no results for that in english, but I was thinking maybe it's an exercise only really known about in Japan. For the most part, Shirobako has solid references to existing things.
Is this dance a real exercise or was it just created for the show?