Shownotes:
RUNNING BEYOND BOOK
https://www.amazon.de/Ultral%C3%A4ufe-Die-h%C3%A4rtesten-Rennen-Welt/dp/366710703X/ref=sr_1_2?ie=UTF8&qid=1480446464&sr=8-2&keywords=ian+corless
https://www.amazon.de/Running-Beyond-Ultra-Trail-Skyrunning/dp/1781315256/ref=sr_1_1?ie=UTF8&qid=1480453835&sr=8-1&keywords=ian+corless
http://www.wolfgang-olbrich.de/training/ultramarathonplaene