I'm starting ADT with a Lupron injection next week, and then we're doing five rads of SBRT-TrueBeam STX sometime next month. Both my urologist and RO told me that I should maintain or vary my current fitness regime of power yoga, TRX workouts and brisk walking throughout the entire treatment lifecycle. In addition, I switched to a more plant-based diet similar to the Mediterranean Diet. They told me that the guys who seems to have the most weight gain and possible other side-effects such as fatigue and bladder or bowel issues may not be very active. Exercise can help offset or reduce physical side-effects, and may help with some of the mental and emotional side-effects, but everyone's experience will vary.