@richard11 Aside from what others have said, I don't think others appreciate that there is a LOT of scaling and adapting that goes on in the classes. Weight is obvious but substituting movements might be even more important. You Do You is almost a mantra.
Class Taker: I can't/don't want to do X movement/lift because I {am hurt, am sore, just don't have a desire to}.
Coach: Got ya. How about doing Y instead?
Class Taker: Great. That I can do.
Tomorrow, for example, has rope climbs programmed. I find no joy in doing those so I'll do something else. A coach may say "Ya know, you really can do those." and I'll say "I could but I'm going to do pull ups instead." And they will chuckle and say great.
You don't see that exchange in fail videos or at the Games but it's a fact in just almost 100% of the classes I've been in.