Stand in one spot for HOURS on end. I remember one time, we couldn't leave a single 1ft by 1ft, tile for 8hrs straight.
No joke, it gave me 3 stress fractures in each foot, which made the rest of basic training EXTREMELY painful for me. I didn't go to the doctor until it was almost over, for fear of being put in Rehab until they got better. (which means I would have to be in basic for that much longer)
But no, that's not the most challenging part of Basic. That's just one of the worst parts. The rest may be extremely challenging, but at least they are somewhat fun. Even getting smoked was better than reception.
I can't remember what I would call the most challenging part, because it's all pretty challenging and hard.
