Ben Greenfield

Ben Greenfield (born December 20, 1981) is a triathlete, personal trainer, nutritionist, author, public speaker, and former bodybuilder known for the practice of biohacking. He has participated in 13 Ironman competitions and over 120 races, becoming a USA Triathlon top-ranked athlete in his age group for a period of time.

Early life and education Greenfield was born in Lewiston, Idaho.

Greenfield attended Lewis–Clark State College, where he played collegiate tennis. He would go on to graduate from the University of Idaho, receiving a bachelor's degree and a master's degree in sports science and exercise physiology.

Career

Greenfield is the founder of Ben Greenfield Life, a personal blog hosting articles and fitness tips, co-founder of Life Network, a health and wellness platform, and co-founder of KION (which began as Greenfield Fitness Systems), a supplement company. He holds certifications in Sports Nutrition from the International Society of Sports Nutrition, Advanced Bicycle Fitting from Serotta, Strength and Conditioning, and Personal Training from the National Strength and Conditioning Association (NSCA).

Greenfield began training for Spartan races in 2010, building several obstacles on the property where he lived at the time. He competed in a series of races leading up to, and including, the 2017 Reebok Spartan Race World Championship.

He began heavily focusing on biohacking while taking part in the 2011 Hawaii Ironman Triathlon. In that same year. Greenfield released a downloadable fitness program designed to help athletes maximize their training for triathlons, called Triathlon Dominator.

In 2019, Greenfield presented a talk at TEDxCoeurdalene, titled "Bio Hacking or Ancient Ways of Living?". In that same year, he was a guest on The Joe Rogan Experience.

In June 2025, Greenfield was appointed as a strategic advisor to Gurner Group’s Saint Haven and SAINT private health clubs. As part of the partnership, he will develop anti-aging protocols for the group, evaluating nutrition, training, and other longevity modalities.

Media Greenfield has appeared on the television shows Spartan: The Ultimate Team Challenge (NBC) and Steve Austin's Broken Skull Challenge. which has featured guests like Twitter co-founder and chief executive officer, Jack Dorsey, among others. Greenfield’s first podcast launched in 2007. He also previously hosted the Get-Fit Guy podcast.