When elite ultrarunners have a need for speed, they turn to coach Jason Koop. Now the sport’s leading coach makes his highly effective ultramarathon training

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***Updated and expanded new edition*** An Updated, Interactive Guide to Take Your Running to the Next Level With 20 years of running and competing around the wo

'Filled to the brim with advice, tips and inspiration to enable you to achieve your dreams over whatever distance you want your legs to carry you' Chrissie Well