It seems to me that both teams would be playing in the unbearable May time Charleston weather! With that said it comes down to more strategy by the caoches. If a coach wants to gamble on young man whose endurance is not as great as others than that is his choosing. Please don't tell me it is a health issue either the player is in condition and able to perform or not. I watched numerous games this summer in 104 degree weather by all age groups. Again, both teams are playing in it. Soccer should be a game of endurance. I did not say that you measured the heart of a player but had visibility into his heart in the later stages of a crueling physical contest. That is competition and this competition is what makes soccer so enjoyable to watch. I watched games this weekend where parents of players were upset that Johnny got hurt on a physical and fair play. Although, Johnny was playing up in age group the parents still had a problem with the big kid on the other side who was just playing hard. If a kid can't play at that level then they shouldn't play at that level. That is why you have different levels of competition (IE JV & Varsity).