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Road & Trail Running Coach: 1-1 Coaching Built Around Your Life
Work with a real person who values your goals as highly as you do. Treeline Endurance coaching is designed for athletes (and soon-to-be athletes), who want a UESCA-certified coach in their corner. With a Masters in Exercise Physiology and Nutrition Science, Greg builds training that's rooted in science, not a generic template.
No pressure, no sales pitch. Just a brief conversation about your goals and whether we're the right fit.
200+ Athletes Coached • 100 Mile Finishers • Boston Marathon Qualifiers • TrainingPeaks Coach
David J. (World Majors Finisher)
"Greg is an excellent, informed listener who has the skills and patience to get to know me, and to then provide targeted assistance to help me improve my running."
Will B. (100k Finisher)
"Working with Treeline Endurance has hands-down been the best decision I've made for my training."
Mac L. (Sub 4 hr marathon finisher)
"I crushed my first-ever marathon thanks to Greg. His passion and knowledge as a coach is unmatched and makes you realize how far you can push yourself."
Meet Your Coach
Greg Marshall is the Head Coach and Founder of Treeline Endurance and coaching is his full-time job, not a side gig. He holds a UESCA certification and a master's in Exercise and Nutrition Sciences, and he's obsessed with the science of endurance training.
Greg didn't start as an athlete; he joined his high school cross country team on a dare, got humbled by running, and then got hooked. He knows what it takes to go from the back of the pack to the front, and what it takes to stay there: he's crewed and paced athletes through Western States 100, Cocodona 250, and Bigfoot 200, and trains athletes chasing everything from their first finish line to Western States qualifiers.
His work has been featured in Outside Magazine and Believe in the Run, and he's coached athletes all over the world, including the United States, U.K., Argentina, Switzerland, Oman, New Zealand, Australia, Taiwan, and Bulgaria, just to name a few. At Treeline, every athlete is coached, not just programmed, by Greg himself: training that adapts to your life, pushes you without burning you out, and comes from someone who shows up.
Coach Greg advises an athlete at mile 30 of her first 50 miler.
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Coach Greg in his first year of cross country vs later in his first 50k.
Not a Spreadsheet. Not Another AI App.
Adaptation is individualized, shifting week to week with your recovery, stress, and terrain. That's exercise science, not opinion. AI plans and template spreadsheets are built for controlled conditions: flat roads, stable weather, predictable schedules. Training is rarely like that.
Generic plans and AI consistently struggle with:
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Regional terrain (desert, alpine, forest, snowy trails)
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Elevation profile and vertical gain
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Weather volatility, wildfire smoke, seasonal trail access
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Long-duration fatigue management
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Gear, fueling, pacing decisions
Coach Greg pacing athlete Cutler Andrews during Cruel Jewel 100 Mile.
It also pushes goal pursuit without weighing tradeoffs like recovery, work, and family. A human coach helps you level-set, not just optimize.
We promise something different: no forgotten spreadsheets, no terrain-agnostic workouts, no unrealistic race paces, no plan that can't tell you apart from anyone else. Every athlete's training is built and adjusted by a real coach, week to week, someone who catches fatigue before it becomes injury, pushes your limits, cares whether you still love the sport when you cross the finish line, and reads between the lines to make the calls a template can't.
Coach Greg with athlete Alex Baker at the start of Collegiate Peaks 50 Mile.
What Happens on the Call
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We hop on a video or phone call. No pressure, no pitch.
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We talk about where you're at, what you're training for, and what's worked (or hasn't) so far.
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If it's a good fit, we send you an Athlete Profile to build your training around. If it's not, no hard feelings. We'll help point you somewhere that is.
Pricing
Silver Athletes
$229/month
*Additional taxes may apply
What's Included:
● Free initial coaching consultation
● Free Download of our training E-Book
● TrainingPeaks Premium Account
● Custom training plan built for your life
● Unlimited emails per month
● One phone call per month
● Two plan adjustments per month
● Personalized feedback on KEY workouts
Gold Athletes
$359/month
*Additional taxes may apply
What's Included::
● Free initial coaching consultation
● Free Download of our training E-Book
● TrainingPeaks Premium Account
● Custom training plan built for your life
● Unlimited emails
● Unlimited phone calls
● Unlimited plan adjustments
● Personalized feedback on EVERY workout
● Strength & Conditioning Workouts
Custom Training Plan
$50 / Month
*Additional taxes may apply
Order a custom-built training plan to prepare for your next event, reach a new goal, or develop your base fitness. 3 months minimum. All plans include:
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Every Workout, Aerobic Run, and Recovery session for the plan duration.
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A strength training protocol to fit your needs (optional, no added fees)
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FREE Download of our new E-Book, "The Treeline Guide to Taking it in Stride: How to Adjust Training on the Fly"
