A lot of ways that are available to improve yourself is actually free.
We live in a day and time that most information is free. Many people are walking around with cell phones in their hands that have internet access. You literally have a library in the palm of your hand. There's no excuse to be ignorant of anything.
Taking care of your body through exercise can be done without a gym membership. Any individual can take time out each day to do simple push-ups or sit-ups. Even a simple walk around your neighborhood block is considered good exercise.
Just doing small things each day can go a long way.