What is it about these "cols"?

If you have never ridden a col with your bike, here is some insights about how it feels: hard, painful, long, sweaty, exhausting!! However it is something you want to do over and over! Why? Do you have to be a sadomaso to enjoy it or simply the fool who hits his head with the hammer because it feels good when he stops? No! It is only because behind all this pain and suffering there is something else which overcome all this discomfort! Is it the scenery, the nature, the sensations, the feeling, the effort, the endomorphins flowing through your body, the relaxation of the mind? Probably all that and more! Each one has his personal experience in that respect but one thing for sure: IT FEELS GOOD!