Mr. Karl Rentzheimer is a very wonderful man. He is inspiring to me and is a great father figure. anybody who doesnt like him is either afraid of his gigantic arm muscles or is a bad student probably. He is one of the greatest men ive ever met. He always sets a positive attitude for the classroom and leaves me smiling at the end of every day. I hope he liked the chocolate i gave him today lol ;) - Hope Riley
Rentz is the MAN. hes an AWEsOme teacher and really cool to talk to. gata luv rentz!
Great coach!! dont mess wit rentz or you will get messed up. Hit the weightroom sally, i'll be waiting.
His classes are great. Always quick with a joke. It's not his fault some students don't listen when he asks them to do something
Rentz is the MAN! He is an awesome gym teacher, he can get everyone involved-tons of fun :)
I had him for health n he was great.He made it as compfortable as possible and gave us some good tips.
He's ok. He needs to learn to lighten up. Not get so uptight and angry with students who arent perfect
I've had him for gym for 4 years, and i've done nothing athletic in gym for 4 years. You da man!