The trail race that I'm talking about is a 50k (5 laps of 6.2 miles each). He's got it set up to where you donate whatever you want, run as many laps as you want, write down your own time (honor system), and anyone who finishes further than 26.2 miles gets their name and time published in some marathoner's magazine. The one time I did it, I did one lap in an hour and some odd minutes. It was really hard. I walked a lot of it as most of it is brutally uphill. I think the elevation change from the lowest point to the highest is 1,000 feet - in 3.1 miles (that much change from the starting point to the 3.1 mile turn around point). Some people run it with their dogs!!! For Iowa, that's a pretty steep climb! lol I don't imagine it's too hard to find elevation changes like that in Tennessee.