The rise of the ultra runners

"Utra running is now a thriving global industry . . . [the author] travels to the heart of the sport to investigate the reasons behind its rise and discover what it takes to join the ranks of these ultra athletes. Through encounters with the extreme . . . characters of the ultra marathon world, and his own experiences of running ultras everywhere from the deserts of Oman to the Rocky Mountains . . [an] account of people testing the boundaries of human endeavor"--Provided by publisher.