How do you get good at a hobby?

You can get good at a hobby with a lot of practice.  Some hobbies that require a lot of practice to get good are gymnastics, swimming, sports, and running.  The practice required for to become skilled at these hobbies is done through drills and repetition.  This creates the muscle memory needed to perform at the highest levels.  The practice also changes the body and increases your cardiovascular's system to handle high stress loads on the body with ease in the presence of less oxygen and high physical intensity.