If you are doing a PhD, then that is your side hustle. Or figure out a way to make make it into one. But you have no bandwidth left for normal side hustles.
Prioritizing workouts in this situation is just vanity and poor judgement. With so many other things going on, the minimum needed for adequate health is what you should target.
You have to be extremely targeted with your socialization. It should include some video, text or voice meetings for efficiency sometimes.
If you are able to keep the job and complete the PhD at the same time, that is a major feat. Not that others haven't done it. But both things can easily demand most of your energy. So one of them probably needs to be somewhat lightweight for it to work out. I don't know a ton about it but maybe you can stretch the PhD out a bit to make it more feasible.
If you can somehow manage financially to drop the full time job and you are serious about the PhD, then you should quit that job. Unless it's literally just standing or sitting around with hours every day that you can focus on the PhD while supposedly working. Maybe replace with a part-time job.
I don’t think it’s reasonable to even try to pursue side hustles in your situation, it makes no sense and I’d be surprised if you’ve even been able to give any attention to this at all - just stop telling yourself you need to do it/forgive yourself for not doing this even if you think you should.
One thing that helps me squeeze in exercise is working out by 1. commuting via bike/walk to work 2. going on a run at lunch time when I wfh 3. lifting weights during regular work hours around 2-3pm (easier than you think in most office jobs. not always possible though)
Instead of focusing on doing the thing, focus on doing the things that makes doing the thing easy.
For example, don’t focus on going to bed early, focus on avoiding caffeine after noon and winding down your routine an hour before your target bed time. Don’t focus on going to the gym but focus on living somewhere that is close to a gym. Same with eating well, develop a system that makes it convenient to eat well. For example, I do a mix of grocery delivery and meal kits because I know I hate grocery shopping.
By focusing upstream on making downstream execution easy, things fall into place and it all feels more actionable.
If you want to become rich, then ask how much you want to do that, and would you sacrifice all the other things. Quit your job and PhD and do startups, or maybe double down on the job, get up the FAANG levels and build investments.
Or is it curiosity driven, maybe you love going deep in the PhD but miss building stuff, so you do the side hussles. Could the PhD be steered towards something more "buildy" (even though it is mainly research and thesis writing). But a lot of AI PhDs they seem to at least build something, and some of it looks like fun stuff.
I have a theory about workouts, in that it is a slider scale, not all or nothing. You don't need to do 10 hours a week at the Gym to tick the box (I have mild CFS, which is like having the flu 4 days a week, and I do 2 hours a week, slow paced, to help with that. 0 or 10 would be very bad for me).
How much does going to the gym mean to you, maybe you could buy some weights and do most of it at home.
Finally you said commitments. I think a lot of that stuff is choices.
- Read "Deep work": 3-4 hours of deep work on 1 thing gives you more time to spend on the other things.
- Wake up early: Get started at 6-7 am and be done with your deep work session by noon. And/or work on it at night.