Having good posture can save your spine from a world of pain. Most cases of lower back pain can be contributed to poor posture. Fortunately, you can improve your posture though exercise, without even going to a gym.
Stand on your doorway and place both hands on the doorframe. Lean forward so your chest sticks out and your hands are behind you. Do this for a few reps, holding for 10 seconds each time. Doing pull-ups on a pull-up bar can also help strengthen your back muscles while realigning your spine. For more exercises that can improve your posture, click here:: 7 Exercises to Correct Bad Posture (No Equipment Required)