It wouldn't be anything for you either as you are a walker. The only ones that had a problem were very sedentary, but, they were pretty tenacious and I didn't see anyone left behind. There were no big lines, so I could see clearly who was and wasn't making progress.
The fort was pretty cool and I actually hope to go back another time. Three times is never enough!
I would love to visit there sometime I love old forts and fortresses