Is your mountain bike covered in mud? Chances are the part hit hardest by the mud was the bottom bracket. Singletrack.com's Lennard Zinn explains how to remove, clean, and replace a bottom bracket square taper crank.
Singletrack.com's Lennard Zinn demonstrates how to install new cleats on your shoes. This is something that you want to get really familiar with because getting them set right can sometimes take many adjustments.