One year at school I had a really good PE teacher, in the first lesson he asked the class what we wanted to do, we all replied that we wanted to do 5-a-side football indoors, he organized it. For that year nobody brought sick notes, everybody was there every week and got really fit. After a month or two he started occasionally suggesting other things we might like to try, similar non-contact sports that wouldn't scare off our group of smart boys, by this point we trusted his advice and were happy to try the new things too.