It's true that you run indoors if the weather is bad. Depending on the time of year, it may be a good or bad thing. I was there in the winter time, and being inside meant not freezing my ass off during a PRT nothing worse than doing all that in sweats, hat, and gloves.I have not yet been to OCS, but I have heard that if the weather is bad you run it indoors in a gym. I think doing that would cause you to run slower than usual. Tighter turns tire your legs out faster.