Vijai Singh/The New York Times The Roving Runner, Brian Fidelman, left, with the author Christopher McDougall, taking a break from a barefoot run in Central Park in Manhattan. | Ken Bob's Original BarefootRunning.com

Vijai Singh/The New York Times The Roving Runner, Brian Fidelman, left, with the author Christopher McDougall, taking a break from a barefoot run in Central Park in Manhattan.

Vijai Singh/The New York Times The Roving Runner, Brian Fidelman, left, with the author Christopher McDougall, taking a break from a barefoot run in Central Park in Manhattan.

Vijai Singh/The New York Times The Roving Runner, Brian Fidelman, left, with the author Christopher McDougall, taking a break from a barefoot run in Central Park in Manhattan.

Vijai Singh/The New York Times The Roving Runner, Brian Fidelman, left, with the author Christopher McDougall, taking a break from a barefoot run in Central Park in Manhattan.