Thanks Jessica, I am going to read the link now. See I have a two part workout for him, now that it's getting warmer I am not sure if part 1 will bring him up too hot before the second part. I usually don't let him drink water until we are done with the workout, I am just a little worried that with this heat it may be too much for him. He wouldn't have eaten for almost 24 hours though... so I was hoping that it would be safe for him to take couple of sips before we finish out.