The group put themselves through challenges that forced them to find the physical and mental strength to succeed. Examples included training without food or water, or sleeping on the floor without a blanket, to learn to endure the cold. For example, no one in the group was permitted to be late for training, as it would hold back the whole group. If any member completed a challenge, everyone else had to do the same thing. During their training no one was allowed to complain or be negative. Few excuses were allowed. For instance, if someone claimed that his shoes were too worn out in order to make a jump, he had to do it anyway, even if it meant doing the jump barefoot. At the same time, everyone was required to have knowledge of their own limits.