If you haven't ever been in the desert it is difficult to understand. I was stationed at 29 Palms in 1990. They made you wait 30 days after you arrived before you were allowed to do any outside PT. On some days all outside activity was stopped between 12 and 6. This was the Marine Corps in the early 1990's when it was still allowed to cuss, demean, and lay hands on people to "adjust" "equipment or posture" when necessary. I remember getting a nose bleed for the first time in my life because it was so dry. I also remember a day where 10 of us were tearing down a whole bunch of GP tents. We each drank 3 big 32 oz bottles of gatorade while we working before the noon deadline. When it was time to leave we realized not a single one of us had taken a piss. I love the desert, but it is definitely something to prepare for, and you should always have water or something to rehydrate yourself with. Always.