Beyond needing to survive, and maintain a reasonable health, a lazy person can just while their time away and not do anything meaningful (in getting oneself better - better health, better earning ability, learn more skills etc). Is there a fundamental need to also try to improve as a person? What is the rationale behind self improvement or not wanting to do so?
I don't understand your question. If you don't want to self-improve, don't.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.