It’s ridiculous to think that we have one body, one sole means of functioning, and people are too lazy to take care of themselves. Fit bodies lead to better health, confidence and more success with romantic endeavors. I’d say those are 3 verygood reasons to get in shape.
Learn to focus only on the present.
The past is unchangeable so it is futile to reflect on it unless you are making sure you do not repeat past mistakes. The future is but a result of your actions today. So learn from the past to do better in the present so that you can succeed in the future.