@5galloncan
You mentioned bike riding. Did you have the Space/Oar done? If so asked your R/O about bike riding. I was told not to bike ride.

I went to same institution you did. My treatment was May through July in 2023. I had 30 rounds of proton radiation with the Blue Team and R/O was Dr. Mendenhall.

I got the sun burn type marks on side of hips also. But had not issues with any pain or discomfort. Did not even know the sun burn type discoloration was there until my wife mentioned it. I had minor fatique about 4 weeks in but was able to keep walking, swimming and doing water aerobics. I had more issues with frequent urination and urgency than anything else. All after treatments stopped slowly went away.

I was asked not to bike ride as can interferre with Space/Oar and also can irritate the prostate which is already under bombardment with radiation.

Electrolytes are very important to prevent cramping.