Is that the one where they suddenly have you run two miles?
I was terrified for that one too when I did it. I couldn't believe I not only made it but felt really high-energy afterward. I was ecstatic. (I know that sounds dorky, but I have bad lungs and I thought my entire life that I couldn't run. It wasn't until I started reading about running that I realized I needed to SLOW DOWN to a pace I could manage. I'm still so ridiculously slow that it's very very embarrassing [an 11.5-minute mile is my PR on a 5k], but considering that I was always the girl who couldn't even run down a short block without getting very very out of breath, the day I ran a mile-- albeit extremely slowly-- was amazing to me.)
You're gonna love it.