«[Karnazes'] spirited memoir...can help mere mortals who want to push past their perceived limits or simply jump-start their sedentary lives.»

Chicago Tribune

«Heart-stopping stuff»

The Economist

«Full of euphoric highs...a journey into distance running that is much less about sweat than about the emotional terrain that unfolds at the frontier of endurance.»

New York Times

«An exhibition of unadulterated courage and mental and physical stamina [for] anyone who likes to read about ordinary people doing extraordinary things.»

Boston Globe