RRP USA $12.90. RRP UK ?10.50. Whether it is your 1st marathon or your 100th, this book has methods to make you fitter, faster and more resilient. Dr Jim finished in the top half of his age group at the 2016 Ironman Triathlon World Championship in Kona, Hawaii. A few months earlier, he ran 3 marathons sub-3 hours in 3 weeks, including his lifetime fastest (2:51) and 3rd fastest (2:55). Dr Jim is faster than ever at age 53 and he reveals his secrets...