I sit ~10 hours daily, including 2+ hours driving. I'm naturally skinny but haven't done much physical exercises in recent years ("busy"). Now, at age of 34, I'm starting to realize that my body won't last forever and finally started to exercise few times per week, after I found motivating enough guide¹. It amazing how much more energized it makes you feel. [1] https://www.julian.com/learn/muscle/intro
From the linked website:
> Recognize that all these guys have low body fat, which helps reveal their muscles. You will not actually lose fat by lifting weights, so weight loss is a separate goal altogether.