True. But you can also be smart about it, and it doesn't have to be something that takes your whole afternoon. 15 minutes of home exercise instead of media scrolling, and at the end of the week, it is 1:45, at the end of the month 7:45 that you've done something. Or just a simple door frame exercise bar where you do a pushup or two now and then. These small things add up. Or to go with friends to play football or my friend started to run, they made a Sunday morning running group. To end with what you've begun, regularity is the key.

I've managed to build a significant amount of muscle mass just from doing stretchy-band PT exercises to deal with shoulder pain. 10-15 minutes nearly every day makes a big difference. I've also started developing some serious leg muscles just from walking up and down stairs in my 2-story house (+basement) and around my mildly hilly neighborhood.

I drive as little as possible; I went on a 1200 mile road trip last weekend and I'm still paying for so much sitting.