Join a gym that is near to your home..!! Ask your friends to join you also..!! That'll make you gain interest in The Gym.
Train like your Coach asks you to do. Also keep reading Blogs of Body Building and Martial Arts.!!
That's Why Karate is probably known for self-defense..!!:rolleyes::rolleyes: Take your instructor advice seriously..!! You might have some questions in your mind even after instructions from your instructor. keep reading Blogs in your free time, so you mighty have some clarity about that..