That's funny! I've seen people throw up from exertion- come close myself. If I may be honest, he's probably just threatened by your athletic prowess and is (unconsciously) trying to negate your success... As someone else suggested, have him ride a century- or two- with you, or throw him in a pool and see if can do repeats of 100s on whatever time and see how he does!

But then, again, Freud I'm not

My DH knows better than to say such things- I'd bop him right in the nose!