The guy should've said something along the lines of "I guess I have to do all the events for you guys. Lord knows you guys don't seem to be the athletic types. I wonder if any of you can even
fit into the outfits we design here." or something to insinuate that his classmates are lazy and out of shape. It would've either motivated them to take part in some games, or it would've backfired intensely and he would be murdered by his classmates. Either way it would be more entertaining than how he actually reacted to these turn of events.
Also why aren't his two harem girls trying to ease the burden on him by participating in some of the events for him, considering they feel bad for him? (You know outside of the author wanting to put them in cheerleader outfits)
@unmellow
I'm sure in the minds of some of those girls, there's no such thing as bias against men.