That's great! But also, don't let the great be the enemy of the good. Cancer, aging, and meds are already putting a huge strain on your body, so the goal is to nurture it, not punish it.

I've discovered that with 4 years of ADT and my spinal damage, there's an energy cliff that I can suddenly fall off with no warning. I don't get gradually fatigued any more; I just take one step too far and there's suddenly no ground under my feet and I'm out for a few days.

So I've stopped pushing myself to bench even more weight, walk even more steps faster, etc and just focus on moderate resistance training and keeping in motion. Over the past four years my body got me out of the hospital bed into the wheelchair, out of the wheelchair into the walker, out of the walker to the cane, and then from the cane to maybe 80% of my former mobility, which is nothing short of a miracle. It deserves some TLC after that. So I'm giving it what it likes (moderate weights, nice walks, healthy home-made meals, a bit of canoe paddling) but no longer pushing it to hit new milestones. And it's returning the love: fewer and fewer night sweats, afternoon naps, etc.

YMMV