Is there a spiritual obligation to take care of your body?

Kanye said "why everything that sposed to be bad make me feel so good?" and I think about it a lot. Working out, getting good sleep, staying sober, eating healthy... they aren't fun, but they materially improve my life. Another quote that comes to mind is "Hard Choices, Easy Life. Easy Choices, Hard Life", and yet another is "I have the desire to do what is good, but I cannot carry it out. For I do not do the good I want to do, but the evil I do not want to do—this I keep on doing".

I think we've all observed that life constantly presents us with opportunities to delay gratification. But ceaselessly delaying cannot be the correct answer either, for there is an expiration date on when we can cash-in effort. The phrase "you can't take it with you" comes to mind.

One's belief in the afterlife certainly changes the calculus on this. Especially if you believe that denial of the flesh in this earthly realm will be rewarded in the infinite realm. "[W]here your treasure is, there your heart will be also." I want to overcome my fleshly desires, I want my heart to be aligned with the infinite spirit within me.

I think this may be why bodily pleasures are fleeting and spiritual pleasures are enduring. The body is fleeting, the spirit enduring. Denying the flesh hurts today, denying the spirit hurts forever. But why is working out a spiritual endeavour? Why would it not be spiritually preferable to replace my gym time with prayer, meditation, and bible study?

I'm struggling to find a good answer to that question honestly. I'm thinking something about physical health being a precursor to continued existence. But why is continued existence spiritually important? Why delay my soul's warp into hyperspace? I actually am finding it totally difficult to answer that question in a manner that seems self-evident to me. I asked AI because I am losing my capacity to think for myself 🥴. It pointed to some scripture that of course talks about our body is God's temple, and I can accept that. But it still isn't a logically convincing to me.

I admittedly work out for mostly vain reasons. I want to look good, I want to be attractive, I want to be physically powerful. Sure it may energize me to make more time for spiritually fulfilling endeavours but to me, that is a nice side effect at best. I wish I could say that I work out entirely to glorify God, but my fallen mind is not there yet.