teach yoga class to a bunch of lemons?

I have no problems whatsoever. My only problem is that some spas / gyms don't give access to some mats if the random placement of Sims is in a bad order (the Sim can't walk past another and gives up and just stand there. Also Sims who's hygiene goes red will break and walk off).

I also have no issues with guided meditation.

I only have MCCC, no other mods whatsoever.