Do you think that you need to get more exercise? Are you feeling stressed or a bit lonesome? Consider adopting a pet. Daily walks or play time will benefit you as well as the critter. Some of the health benefits related to sharing your life with a pet include lower blood pressure and anxiety. For more (and some surprising) benefits, see this WebMD article on the benefits of pets.
If you decide that you want to provide a home for a pet, I recommend finding one through a shelter or rescue. A couple resources are PetFinder or Adopt-a-pet.You can also contact your city’s animal control department or local Humane Society.