I think we just have to cut corners and not take recommendations too seriously.
The easiest way to get more time is just to work for a large company that provides meals and doesn't make you clock-in and be hyper-efficient with your work so you can slide out after six hour days, but that's easier said than done.
Realize that people who are really physically fit treat it like a hobby, so if you think something is more worth it (writing, guitar, binge drinking with your friends), then don't stress about not accomplishing everything-- it was an intentional trade-off.
And the not really solution-solution is to have enough serotonin so that you're perfectly happy doing things like cooking, running errands, and working out-- which is a big goal of mine.