I read on one survival school website (I think it was the BOSS website) that they often had superfit athletes try their survival program and drop out, while 'less perfect' individuals persevered and prospered. They suggested that "superfit" students were used to eating like pro athletes, and simply couldn't handle being reduced to survival rations (sometimes less than a third of their normal caloric intake).

Must remember that "fit" means "well adapted for the environment", not necessarily "I can outrun a cheetah and bench-press an elephant" <img src="images/graemlins/wink.gif" alt="" />