内容简介：
Six Titles Written in the Exciting Spirit of the Eco Challenge These Titles Will Fascinate and Exhilarate Middle School Readers Ultra pursuits--recall all the attention given to the climbs up Mt. Everest--have long captured people's interest and awe. In recent years, young people have become more and more interested in sporting events that push people to their ultimate limits. Highlighting both the risk-taking and the safety precautions involved in the sports presented, these books also chronicle the personal and physical challenges these unique athletes confront. Bicycle enthusiasts have always enjoyed going the distance. In more recent years, many have turned to ultra distances. Pushing both their bodies and minds to the max, these cyclists hit the roads and the trails with everything they've got This book offers potential marathon cyclists information on tips and tricks, safety, gear, and racing events.