Honestly, I just imported the program like basically it was written, and it is a beginner's program. It seems a little alarmist to me, but the author (Stew Smith) thought it was worth mentioning, so I passed it along. Besides, nobody wants to go into something like th OP is doing injured so why take a chance, right?
EDIT - The basic run progression is Smith's the other stuff, good or bad, is my own thinking.
heavily informed by smarter people than me.