I was diagnosed with Stage 4 in early January. Prostate is a wreck and 3 spots just in my pelvic bones, confirmed with a PET Scan. Started Casodex, then Zytiga followed by Eligard. Radiation starts in April. Did a lot of reading about how terrible ADT is and how exercise can minimize the effects. I walk between 7 & 8 miles a day (having a 2yr old Labrador helps). I joined a gym and hired a personal trainer (who has also had prostate surgery). So far, almost 5 weeks in and the only problem I have had is the occasional hot flash. My PSA is down from 6 to .15 and I honestly don't feel that bad. Push yourself to exercise, your life may depend on it. Keep that in mind when you don't feel like it.