Fez, that's a shame. Pump if taught well, can be a great workout.
I've taught it and I'm a stickler for correct technique - work hard, or go home is my style. Because they know what I do for a job I always get questions after class about technique which I'm happy to help with.
Hate it when instructors americanise it with falseness, so cringeworthy. "Whoo-hoo! you guys are awesome!"
etc. NO NEED!! And don't get me started on how uneducated they are on anatomy...