It's not that unbelievable... Remember, the last half hour or so of the movie, he's training and getting all shaped up and everything. He does this to toughen himself up for the end, from the gun shot wounds, fights, ect.

Thanks for the welcome, Turnbull! I feel honored to be welcomed by you. :p *bows to the almighty Turnbull*

the power of accurate observation is commonly called cynicism by those who have not got it. george bernard shaw