I can really only focus on one thing at a time. Occasionally I can work in a second thing in some free time from doing the first thing, but it's always very clearly shoehorned into whatever schedule I've set up.
Case in point: I feel like all of my effort right now has to go into maintaining my weight, to the point that I don't feel like it leaves enough time for me to have a job. I currently have the desire for my hypothetical job to be one that keeps me active, but with the way corporate America is set up, I won't be able to make enough money to live on my own in the city that I'd be working in with such a job. Because, you know, apparently people whose jobs involve constant physical exertion for 8 hours straight don't deserve to make a living wage. Or, apparently, nobody deserves to make a living wage, according to the rich, the elite, and the Republican.