That's that feeling you get when pounding thru some fireroad miles. Lots of people don't like fireroad riding, but I don't mind it. Sure, singletrack is more fun, but when you want to let you mind totally wander and get some good aerobic activity on the bike, fireroads is where's it at...especially after getting nearly 7+ inches of rain in 3 days.
Set the Zion up in drop-bar mode....works great for this kind of riding. The happy Salsa stem puts the bars up in the right spot for riding in the drops.