It started with a couple of middle-aged women taking a few lunchtime walks and evolved into an adventure of discovery during which they not only climbed the highest mountains in New England, but learned life lessons they have shared in a book, “It’s Not About the Hike.” The women, Nancy Sporberg and Pat Piper, started walking together along the sidewalks of Keene, N.H., in 2006 and gradually set their sights on climbing Mount Katahdin, the highest peak in Maine. They achieved that goal, and over the course of five years covered more than 1,250 miles and climbed to the summits of 190 mountains during all four seasons. The women, both over 50, learned their journey was about friendship and the discovery that “anything could be overcome one step at a time.” The women will present a one-hour, multimedia presentation at the Holliston Public Library on March 29 at 7 p.m., sponsored by the Friends of the Library.