It depends on the challenge, frankly. It depends on what type of motivation is driving you. It depends on what type of challenge it is. No doubt, you could say that walking on a broken leg is a challenge. It's a painful, unfun, stressful challenge. This, is a challenge out of neccessity. When it's a neccessary challenge that you have no say in, that you can't avoid, then you are absolutely correct. However, there is a second kind of challenge. Self challenge. A conscious or even unconscious push and drive, of your own choice and your own free will. For example, self learning, or self teaching yourself. While yes, there will be points in time where it's stressful and difficult, if you are doing the challenge because you want to, because you're after something, then even if the challenge is difficult, the end justifies the means. The satisfaction gained, is incomparable to a challenge out of neccessity. I gain no satisfaction from recovering over being sick, or being hurt, or injured. However, at the end of a day, when I can feel that my body obviously disagrees with the amount of work I did for the day, the satisfaction I gain from seeing, visible progress on work, feeling and knowing that it's me who is improving in some quality, then whatever pain there is means nothing. The true good things in life don't come easy. They never do. And that's what makes them worth it. Because it's not a challenge out of neccessity. It's a challenge of your own choosing. It is fire that you walk into willingly, to come out on the other side with a smile, knowing all along that you had it in you, that you had the ability to try, and you succeeded.