Not a silly argument for the audience that comes to folks like me. They aren't going to commit more than about 3 hours a week (at best - averages to less than that with vacations). That means there's not so much time for fitness. When a new technique is being learned, it slows class down for everyone involved (even if it's not new to them).Agreed I've heard that stuff before about how you need to train in your own time. Well okay sure but one reason people start marital arts is for fitness I mean boxers, Muay Thai fighters etc they work on fitness in the gym and they're good technically so it's a silly argument really
If I was teaching 5 or more days a week, and folks were attending several classes, I could put a lot more emphasis on fitness while they are in the room.