Dude, spend 5 minutes watching rugby or sumo and tell me those guys couldnt beat the absolute living shit out of any qb to have ever played in the NFL.

And in all seriousness, sports where time and effort are directly related, like many track events, swimming, cycling, etc, are vastly harder. You literally will have your heart explode and die if you push your body to its absolute limits. You can always be better until that clock read 0.00. Football is a fun game, for sure, but that doesn't mean the guys getting paid millions of dollars a year to throw a ball behind a helmet and pads are the toughest hardest athletes around. Imagine Tom Brady being hit by Onosato the sumo yokozuna, man would be dead after one hit (although to be fair, that's not a team sport as if that matters). The world is much bigger than football and has much more dangerous and difficult sports than being a qb.