I apologize for any confusion. It seems there might be some misunderstanding. To clarify, physically fit individuals may experience discomfort during exercise, but they do not necessarily have to continue exercising past the point of discomfort to get stronger. Building strength and endurance can be achieved through various factors such as proper training, rest, nutrition, and gradually increasing intensity over time. Pushing oneself too hard and ignoring signs of pain or injury can be counterproductive and potentially harmful. It's important to listen to one's body and exercise in a safe and balanced manner.
