Hobbies are good because they help make people more well-rounded. Someone who spends all their energy on just one thing is going to have more stress (and be less interesting) than someone who has many different interests. Having a hobby helps you to relax and take your mind off stress. Hobbies also give you something creative to do, and that improves your self-esteem. You can also use a hobby as a great way to socialize, which is another healthy thing to do.