No matter what you are working on, there will come a time when you no longer feel growth as you keep repeating yourself. Human growth is a repetition of "a slight right rise, a slight fall, and a sudden right rise. The basic skills of a musical instrument or a sport are simple movements, but if you repeat the same movement for 30 minutes to an hour, you will start to make more mistakes. This is a state where the body becomes tired and the senses become numb at the same time. When this happens, you need to take a break. During this break, your body and mind will get organized, and when you start practicing again, you will be able to do it more smoothly than before the break. However, since this is just a single day of practice, the body will be tired and the accuracy of the movements will continue to decrease. After a few days of repeated practice, you may feel a little out of sorts for a few days, but after that, you will feel a great deal of growth. Basically, this repetition leads to long-term memory. Since long-term memory is the body's memory of movement through repetition, it varies from low quality long-term memory to high quality long-term memory.