The Official Publication of the Grand Traverse Mountain Bike Association. Welcome to the spring edition of Northern Motion Magazine... We've packed this issue with over 50 pages of mountain biking and outdoor action. Our cover article features some expert advice from the world-class cyclist, Brent Bookwalter. The features continue with "Women and Cycling", "Mountain Biking is a Family Affair", "How to Find Your Cycling Posse", race coverage, a spring tune-up guide, skydiving, kayaking, product reviews, and more.