Anyone who says that they feel great before, during and after running (or any exercise) is either lying or a masochist! But the truth is that if we are in comfort all the time, there is no motivation to grow. You get stronger physically when you exercise and you grow as a person when you move outside your comfort zone. Haven't we all see this in our own lives and those of others? I started running not because my couch was so uncomfortable, but because I felt a need for more. But I didn't get up off the couch and start running until that need was greater than the pleasure of just sitting on the couch. Once the need to do something more was greater than the comfort, I was no longer satisfied and pursued something different. Getting involved with a great bunch of runners and helping to start the TATUR running club was an outstanding move which I will be glad I did when I'm old and gray(er).
The same thing goes for my joining the St. Petersburg Toastmaster club. I not only found a way to help me work on overcoming my stage-fright but again, met some wonderful people who I'll be friends with for a very long time. As with running, I didn't take any action until the discomfort (of having to periodically speak in front of people) exceeded my comfort (of not doing anything about it).
"Ok, Mr. wise guy," you say, "so we need to be uncomfortable ALL the time?" Of course not. But when you think back on your life and look at the times you have progressed most spiritually, intellectually, physically, and emotionally, weren't these times when you weren't completely comfy? That's not to say EVERY time you are out of your comfort zone, you are going to come away with a life-changing lesson. If you think that, you are really spinning your wheels. I've found that people with that kind of attitude also want a "Guarantee" before they try something. My thought on that is simple: If you want a guarantee, go buy a new washer. Quit wasting time looking for them and take the chances which can change your life.
One of my FAVORITE quotes is from Theodore Roosevelt:
"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood, who strives valiantly; who errs and comes short again and again; because there is not effort without error and shortcomings; but who does actually strive to do the deed; who knows the great enthusiasm, the great devotion, who spends himself in a worthy cause, who at the best knows in the end the triumph of high achievement and who at the worst, if he fails, at least he fails while daring greatly. So that his place shall never be with those cold and timid souls who know neither victory nor defeat."
Now go out and do great things.