If there's one thing Mona and Beth did a lot of on the two-hour Amazing Race finale, it was running. After messing up the Titanic serving Detour more than 10 times in the penultimate leg, the roller derby moms mistakenly went to the White House and then ran all the way around Nationals Park in Washington, D.C. "That was our theme the whole season," Beth tells TVGuide.com. "We like to get lost and do extra running. ... I read on a fan forum that they call it 'killer fatigue' and we had it. I didn't realize it until it happened, but you really are running on fumes for days and days. The physical stuff wasn't bad for us, but you almost got tunnel vision and aren't thinking properly." Keep reading to see what else they have to say about their navigation problems, why they thought they were going to the White House and more.