Quitting during training is easy. There are so many reasons why you can/should quit but is it really what you want? There are some physical limitations that your body has, but you also can learn techniques to get over them.When you train so hard you come to a point where you "hit a wall". If you haven't experienced this before, it's a feeling where your body feels like giving up and you need to grasp onto your internal willpower to keep going. Everything in your body is telling you to quit. Your muscles are fatigued, and your breath is short,you are running on fumes, and with every rep you think about stopping. Now that decision is up to you to continue or give up.
You might be in the middle of a workout and say to yourself you want to stop. Which we all know, stopping is nicer than saying you quit your workout. As a coach, I see many people who come to that wall. They look at me like I can say something to help them decide to keep going or to stop. Once that person commits one way or the other, that is where you see full potential arise of dwindle.
Now you are faced with 2 choices: quit or continue? Which person are you? The most important thing is to see your decision for what it really is and that is reality. It is not something that can be ignored or lessened. If you choose to continue you realize that you become stronger overall. You become resilient in the face of your fear and you learn to overcome any situation.
I will be the first one to say that choosing to continue over anything you feel will always reap more reward. Your mind is strong, your body will follow.