I was enjoying this book right up to the point where the author advocates a heel strike running form. 2 years ago, despite investing in the most highly reviewed running shoes and custom orthotics, I was barely able to walk and had given up on running. I had plantar fasciitis in both feet, shin splints, sore knees and hips. My 49 year old brother in law, an avid runner, just had his first hip replacement. My running days were over. One night while watching the Daily Show, I saw an interview with Christopher McDougal and his book Born To Run, that literally changed my life. He was the first individual to describe how I was feeling and to offer hope. My wife gave me Born To Run and I started alternating training barefoot over short distances and purchased a pair of Newton performance trainers for longer runs. While the transition to natural running was tough at first, and hard on my calves, I worked really hard to unlearn my bad heel strike habits and to run more naturally. Quarter miles turned into miles, and I will never look back. I am 50 years old now and am training for my first marathon. While much in this book is very valuable, it lost some credibility for me over the heel strike form issue. Especially for us older athletes, in my opinion, the last thing we should be doing is striking on the heel and driving those impact forces through the heel into the knees, hips and back. I would advise reading this book for the three magic bullets and cross training options, and then watch the online videos at newtonrunning.com and read the Harvard studies relative to running form. Other great sources on form are Chi Running and Evolution Running. You can also watch Ryan Hall's amazing form on YouTube. He strikes on the mid foot almost level so his heel never needs to settle far before push off.