Earlier quoted context omitted.
> Most people I know that don't lift don't care about body shapes This is a lie and you know it. Everyone and I mean literally everyone cares about appearances. No matter how you slice it everyone has a style they are trying to project. This same goes for body shape. If we had a pill that instantly -- without effort -- gave everyone a six pack and lean muscular body, everyone of your friends would be on it, because d…
> Problem is one of discipline Not discipline - priorities. I'm lean and fairly fit, and while I would like to be a little bit more muscular I'd rather spend the time at the piano or with my family
Judging this is real hard since fairly fit means such different things for different people, but spending 5 hours a week at the gym isn't a big time investment. It obviously won't be getting you Mr. Olympia body, but it will make you bigger and stronger than most people.
Part of discipline is also fighting against excuses. Excuses like I don't have time to work out. I don't have time to prep my meals. That's why you need discipline.
Taking things to extreme you could wake up at 4:00 am to workout for an hour every single day. Obviously that means giving up on media consumption time during evening to get full night's of rest, but that is why you need discipline.