Runner's World is a globally circulated monthly magazine for runners of all skills sets, published by Rodale Press in Emmaus, Pennsylvania, in the United States. Recognized as the worldwide authority on running information, the mission of Runner’s World is to inform, advise and motivate runners of all ages and abilities.

Runner’s World aims to help runners achieve their personal health, fitness and performance goals while inspiring them with vivid, memorable storytelling.

Runner's World was originally launched in 1966 by Bob Anderson as Distance Running News, and Anderson published the magazine by himself for several years from his home in Manhattan, Kansas. Runner and writer Hal Higdon had been writing for the magazine since the beginning (2nd edition). In 1969, Anderson changed the name of the magazine to Runner's World. He brought on Joe Henderson as chief editor and moved the editorial offices, now named World Publications, to Mountain View, California. Runner's World thrived during the 1970s "running boom", even in the face of competition from the New York-based magazine, The Runner.

Kara Goucher (born Kara Grgas on July 9, 1978) is an American long-distance runner. She was the 10,000 meters bronze medalist at the 2007 World Championships in Athletics and represented her country at the 2008 Beijing Olympics. She made her marathon debut in 2008 and finished third at the Boston Marathon.

She competed collegiately for the University of Colorado and was a three-time NCAA (twice in track and once in cross country) champion.

Goucher was born in Queens, New York. When she was four years old her family (mother Patty and sisters Kelly and Kendall) moved to Duluth, Minnesota after her father was killed by a drunk driver on the Harlem River Drive. When her mother remarried, Kara took her stepfather's name, and was known as Kara Wheeler. Kara got started running in high school. She lives in Portland, Oregon with her husband, fellow American runner Adam Goucher. Kara gave birth to a boy, Colton Mirko, on September 25, 2010.

As a runner for the University of Colorado, Goucher broke out in 2000, becoming the NCAA Outdoor Champion in 3000 m and 5000 m, the NCAA Cross Country Champion, and also a 5000 m Olympic Trials Finalist (eighth). She graduated from the University of Colorado in 2001.

Anton Krupicka is an American ultra-runner. He has won the Leadville 100 twice, the Miwok 100K, the Rocky Raccoon 100 Miler, the Collegiate Peaks 50 Miler, the White River 50 Miler twice (Set 2010 CR 6:25:29), the High Mountain 50k and the Estes Park Marathon. He also came in second in the Western States Endurance Run in 2010 in what would have been a course record time of 15:13:53.

Krupicka is known for his long hair and beard as well as his minimalist approach. He often runs without a shirt and with very lightweight minimal running shoes. He ran his first marathon when he was twelve. During college and in his early 20s he often ran upwards of 200 miles a week. Krupicka is featured in the film Indulgence: 1000 Miles Under The Colorado Sky which chronicles his Summer 2007 training leading up to the Leadville Trail 100.

Krupicka is a graduate student at the University of Colorado. He is pursuing a MA in geography, focused on alpine/mountain watersheds and acid mine drainage. Krupicka earned his BA from Colorado College in 2005, double-majoring in physics and philosophy. In 2006, he completed a second BA at Colorado College in geology.

David Goggins (born 1975) is a Navy SEAL who served in Afghanistan and an ultramarathon runner. After several of his friends died in Afghanistan, Goggins began long-distance running to raise money. In 2005, Goggins entered the 24 hour race in San Diego and was able to run 100 miles in under 19 hours, despite never having run a marathon before. Since then, Goggins competed in many different long distance running events such as the Las Vegas Marathon and the Badwater 135 miler, where he placed highly. By November, 2008, Goggins had raised $200,000 for the soldiers' families.

In 2008 he was named a "Hero of Running" by Runner's World.