All good advice. I'll add from my own experience (on ADT since 2021) that consistency seems far more important than intensity. It's better to walk every morning, even if you can manage only a few blocks some days, than it is to go for a 10K power hike and then be exausted for a week.

Likewise, as @heavyphil mentioned, don't worry about swinging heavy weights, but make sure you visit the bench at least 3–4 times/week.

On ADT, "no pain, no gain" is the wrong approach; your body's already working hard dealing with the cancer and treatment side-effects, so your goal is to support it, not punish it.