Hi Simon,
Both Prostatectomy and HT/RT have side effects, but if you go down the HT/RT route, there is nothing to stop you continuing with your exercise regime during treatment, as long as your body doesn’t object. You might get fatigue, but I would strongly advise you to do as much weight bearing exercise as possible to avoid muscle loss and joint ache.
If you have surgery I would speak to the surgeon for advice on this. The guys I know who went down this route were told to lift nothing heavier than a kettle for 6 weeks, and then to slowly increase their exercise. Some people seem to recover quickly, others take much longer…. perhaps it’s down to how fit you are before going in for surgery. Some would get extremely fatigued if they overdid things on a particular day, then feel shattered for several days after. The thing to remember is that although it’s robotic keyhole surgery, your insides are taking a real battering, and you need to allow time for your body to heal.
Good luck with your decision.
Derek