A lot has been written about the absolute need for exercise with PCa (and other conditions.)
I started exercise with a used Bowflex costing a few hundred dollars, the month after RT stopped. I think its a fun machine to use -- no batteries, no screens, no subscription fees. My wife joined me about 3 months later when she learned she is osteopenic verging on osteoporetic. We use the family/living room as we live in a house by ourselves. One side is for aerobics and mat exercises, the other for Bowflex and dumbbell work. We add fun by playing favorite music CDs -- no commercials, no fees, She does what works for her, I do what works for me. We enjoy a healthy post-exercise snack together.
I like to say we get "hot and sweaty" every night.
The point is to use what one has on hand and make it a lifestyle change. Having the setup in the family room means 24x7 access. None of the hassles of a gym -- eg crowding, cleanliness (wear sandals in the changing room and shower), no masks (for the Covid-averse), zero car drive time, etc. We like to use youtube videos for aerobics, with the TV sound turned off. Doing it with my wife to our choice of music makes it fun. We are losing weight and in the best shape we have been in many years.