I went to AF boot, so the easiest of them all but it was still rough. Honestly, I dont even think the stuff they make you do is good for boosting fitness levels besides the burpees. Its more of a way to get into trainees heads and let them know they aint living with momma anymore. Now, the only mama is the MTI, and hes a very, unkind and unforgiving momma. My MTI was ruthless. Had us chug canteens of water and do pushups until someone threw up their canteen watered stomach. Then we had 60 seconds to clean the dayroom floor spotless or we would do it again.