Over the last thirty years as hiking, backpacking, climbing, trail-running, and other outdoor activities have become more and more popular, the number of races, challenges, and other activities that package elements from more than one trail have also increased. Some of these challenges have set days, like the Phoenix 7 Summit Challenge; and some of these challenges can last over the course of a year, like my friend Jeff Hester’s Six Pack of Peaks challenge. And, as of November 7, 2015, Mission Trails Regional Park inaugurated San Diego’s own trail challenge, the 5-Peak Challenge, which can be completed in a day, or over the course of a year.