Doniphan, ‘Donny’ and Jeff believe in living and moving from their ‘core’ first. And, although this is also their physical training philosophy, Donny and Jeff’s real motivation lies in their ‘core values’ and sharing what’s at their hearts’ core. They are committed to elevating family, friends, the community and themselves while having memorable life experiences together. This is their true business, and they are proud to be promoting this through a best-in-class, one-of-a-kind, health and fitness training brand.

Jeffrey Huling (right) was the co-creator of the TRX Rip Trainer and the Nautilus Glute Drive, both of which, were created out of a garage and have now sold over $25 Million in global sales. Jeff is also the CEO and Co-Founder of Corefirst™, and lives in Denver, Colorado.

Doniphan Stone (left) is the owner of Fearless Personal Training and has been a private trainer for over 10 years. ‘Donny’ was the creator of Iso Straps, the original concept behind the Corefirst™. He co-authored the book Corefirst Devotion, about creating and achieving your goals from the inside out. He is the President and Co-Founder of Corefirst™ and currently lives with his wife, Mia, in Denver Colorado.