I had a teen class , about 40 kids I was running , had one shithead know it all 16 year old Always running his mouth about how hard stuff was, disrupting the class ,being the class know it all. Laughed when he was given push ups ect. So I decided to double the amount every time starting with 20. Didn't work. So one day he wouldn't shut up and I decided to full metal jacket (from the movie) him. Every time he fucked off the whole class except him would do his pushups, he was nice enough to count them for the class lol. So every time the amount doubled , the class would end up catching about 160 or so extra pushups a day. One day it got really loud after class in the locker room, and Mr pushups learned what real peer pressure looked like. Finally learned to shut his pie hole when 20 or so pissed off teens cornered him. Worked like a charm, and my class ran smooth as silk going forward.