This is very good, and it's also worth noting that the benefits can also come from aerobic exercise; and if your joints or back are an issue for waking/running, consider cycling or swimming. Ideally, I think one would do a mixture of both resistance training and steady-state cardio; then later, if fit enough, some HIIT. Worth noting I think that when it comes to something as intensive on the body as going through chemotherapy, strong studies suggest pretty big benefits, which would apply to anyone with energy-based issues, presumably.
The beauty of light aerobic is that to get the benefits of increased energy, you can need only do light aerobic activity that is (a) easy to recover from, and (b) increase mitochondria count, and (c) lowers your weight which translates to a myriad of downstream benefits including less energy consumed at baseline throughout your day.