About
The Story Of
Marathon Handbook
We believe life is better when you run more: and we’ve been helping people do that since 2016.
Our Focus: Your Running
Since we got started in 2016, our goal has been to assist others in their running journey.
Now we’re an established team, we wake up and work every day to help people run more.
Whether this is through our expert articles and training plans, our daily newsletter, our podcast, or our YouTube channel: we wake up and inject a little more running culture into the world, every day.
All of our running writers are certified running coaches, and many are decorated runners and ultrarunners.
We believe that life is better when we run more.
Our Team
Katelyn is an experienced ultra-marathoner with a passion for the trails. She trains both trail and road runners in her running club, 30 Grados Trail Running, based in Costa Rica, and virtually with runners from all over the globe.
Senior News Reporter
Track Runner, Pro Cyclist, Bachelor of Kinesiology with Nutrition
Jessy has been active her whole life, competing in cross-country, track running, and soccer throughout her undergrad.
She pivoted to road cycling after completing her Bachelor of Kinesiology with Nutrition from Acadia University.
Jessy is currently a professional road cyclist living and training in Spain.
Brady Holmer
SPORTS SCIENCE EDITOR
MSc in Human Performance. Endurance athlete. Science writer.
Brady Holmer has a Bachelor’s degree in Exercise Science from Northern Kentucky University and a Ph.D. in Applied Physiology and Kinesiology from the University of Florida.
He was a division I cross country and track and field athlete and continues to participate in endurance sports recreationally.
Brady writes his weekly Physiologically Speaking newsletter, and took over the reins of the Run Long, Run Healthy newsletter from Amby Burfoot in early 2025.
He lives in Austin, Texas with his wife, son, and dog.
Thomas is an ultra-runner and UESCA-certified running coach, as well as the founder of Marathon Handbook.
He likes running interesting races in weird places (he even wrote a how-to book for week-long self-supported races), and playing with his three tiny kids in his home outside of Madrid, Spain…though he’s quick to remind everyone that he’s a proud Scot.
Hailing from Brighton, UK, Felix is a lover of running, cycling, and all things active.
Felix does a lot of behind-the-scenes work on Marathon Handbook, including big projects like our training plan databases and online calculators which our audience love to check out.
When he’s not exploring a remote corner of the globe on a bike-packing trip, Felix enjoys meditating, recording music, and running on trails as far as his legs will let him!
Our Gear Picks:
Our Editorial Standards
Marathon Handbook is committed to producing accurate, evidence-based running content that helps real runners get better results. Here is how we work to earn your trust:
Editorial Independence
Marathon Handbook accepts no payment for editorial coverage. When we recommend a product (shoes, gear, supplements), the recommendation is based on testing and expert assessment, not on whether the brand has paid us. Our Statement of Independence details our position on sponsorships, gifted products, and affiliate links.
Evidence & Sources
Articles about physiology, training science, nutrition, and injury are written by qualified coaches and grounded in peer-reviewed sports medicine research. Where we quote specific studies, statistics, or claims, we link to the original source. Where we share personal coaching experience, we say so clearly.
Product Testing
Running shoe and gear reviews are based on actual testing by our team of certified running coaches. We log mileage on each pair, run them in varied conditions, and assess durability over time. Reviews are updated when products are discontinued or substantially redesigned.
Updates & Corrections
Endurance running science evolves. We routinely revisit and update older articles to reflect current research and to correct anything we got wrong. Every article shows its last-updated date at the top, and significant content updates are noted in the article itself. If you spot an error, contact us — we will fix it.
Medical & Safety Disclaimer
Marathon Handbook content is for informational and educational purposes only. Nothing on this site is intended as personal medical advice, diagnosis, or treatment. Always consult a qualified medical professional before starting a new training program, changing your diet, or treating an injury.
