Can oncologist recommend pool as medically necessary for cancer care?

I’m looking at putting in a pool for future exercise and health. I thought it would help keep my boys busy. In researching, it seems a plunge pool is best so that I can exercise, manage sanitation, and use year round in South Carolina. It has numerous health benefits and can support recovery. Has anybody had their oncologist writes a suggest as medically necessary? Does anybody have experience with this? It will take the weight off my breast once I’m cleared. It seems positive for mental health. I want to keep active, return to activity and avoid public pools, guns, etc the next year as I start treatment.