Originally Posted by
wolfchild
I disagree with you....There is huge big difference between a 2 hour spin on a stationary bike in an air conditioned room and a 6 hour ride outdoors in a 90+++ degree heat...Riding a stationary bike indoors in an air conditioned room won't acclimatize your body and create other physiological adaptations which are required for long distance rides outdoors. So the most effective way to train for long distance rides in hot weather is to ride outdoors.
There's something to be said about acclimating yourself to the conditions, but show me someone that thinks that riding indoors in AC is a cakewalk and I'll show you someone that hasn't ridden indoors in AC. Riding performance often suffers indoors because it can be a struggle to provide enough cooling and oxygen to a stationary rider.