By: Jennifer A. Kurtz, PhD, CSCS, CISSN, EP-C

The science of carb metabolism, risks of chronic high-sugar fueling, and how to adjust your intake based on training, carb type, and biomarkers. A must-read for endurance athletes.

With Karl Meltzer

With the most 100-mile wins in history, Karl shares insights on racing, directing, music, golf—and why keeping it chill might be the ultimate endurance strategy.

By First Endurance

First Endurance has partnered with Kelly Benefits Cycling to help develop the next generation of elite cyclists. KBS is a top U.S. development program known for producing results—and future leaders.

By Matt Denis

Meet Matt Denis, First Endurance’s new copywriter—and a competitive cyclist who knows the grind firsthand. He’s been channeling pro-level insights into our content all year, and now he’s turning the spotlight on himself in this Q&A.

By First Endurance

EFS-PRO is based on athlete feedback, surveys, and testing. The science is complex—but at its core, it’s all about one thing: carbs.

With Alex Howes

Former WorldTour pro Alex Howes shares how he’s training for the grueling 200-mile Unbound gravel race, drawing on years of elite road and dirt racing experience.

By Dr. Luke Bucci, PhD

Dr. Bucci helps us read the MultiV label like he does, focusing on four “sexy” ingredients that support performance.

By Jeff Rocco MD

Beta glucans are naturally occurring polysaccharides of D-glucose monomers linked by beta-glycosidic bonds.  An ever-growing body of research demonstrates that they have a pronounced supporting effect on human immune systems.

By Dr. Luke Bucci, PhD

The past few years have seen intense research conducted and published on long-term endurance exercise and changes in your immune system. Surveying this research helps explain the causes and complications while providing avenues for athletes to avoid them – or at least mitigate the risk of exposure.

By Jennifer Kurtz, PhD, CISSN, CSCS, EP-C

Dr. Kurtz takes a look at specific nutritional strategies that female athletes can take to get the most out of their performance and recovery during the menstrual cycles, including specific carb-intake recommendations and a handful of nutrients that are especially critical for each phase.

By Jennifer Kurtz, PhD, CISSN, CSCS, EP-C

Jennifer Kurtz dispels some of the confusion around carbs, avoiding too little and too much to find that perfect middle ground of enough.

By Josiah Middaugh - 15x XTERRA National Champion

To help any aspiring triathletes and provide a refresher to vets looking to refine their game (these comments don’t only apply to beginners), I’ve written down some of the most common mistakes I see triathletes make – or that I’ve made myself!

Hot Tubes Development Team has been a standout presence in junior elite cycling races across the U.S. since the early ’90s, known for producing national champions and future pros. They're also helping grow the sport in North America—powered by First Endurance.