Jenny McCoy
Contributing Writer
Jenny is a Boulder, Colorado-based health and fitness journalist. She’s been freelancing for Runner’s World since 2015 and especially loves to write human interest profiles, in-depth service pieces and stories that explore the intersection of exercise and mental health. Her work has also been published by SELF, Men’s Journal, and Condé Nast Traveler, among other outlets. When she’s not running or writing, Jenny enjoys coaching youth swimming, rereading Harry Potter, and buying too many houseplants.
Why Does It Take So Long to Reach Your Marathon Potential?
Jan 14, 2025.
Common Running Mistakes That Stop Beginners From Running Longer—Plus How to Fix Them
Jun 28, 2025.
10 Running Longevity Secrets So You Can Keep Clocking Miles for Longer
Coaches and older runners share the advice that can help you prolong your athletic career.
How to Treat Tight Calves for Better Running
Download Your Training Plan.
When Should You Pause Your Running Watch? It Depends
Apr 3, 2025.
7 Flat and Fast Downhill Marathons to Help You Crush Your PR, or Maybe Even Yet Nab a BQ
If you're serious about clocking a faster marathon time, then these races are definitely worth your consideration.
Knee Pain? Hip Pain? These Common Muscle Weaknesses in Runners Are Often the Culprit
Jan 14, 2025.
The Best QL Stretches and Exercises for Addressing Low Back or Hip Pain
Coaches and older runners share the advice that can help you prolong your athletic career.
If You Want to Run Faster, Add These 4 Plyometric Exercises to Your Warmup Routine
Incorporating just a few simple moves before your next speed or hill workout can yield sizable results.
How to Build Stamina and Why It Matters for Runners
Stuck in a speed rut? These coach-backed tips will boost your pace.
How to Run Slower on Your Zone 2 Days
Follow this advice for reining in your pace so you can reap all the awesome benefits of easy running.
How to Master Zone 3 Training to Maximize the Benefits and Avoid the Pitfalls
Everything you need to know about training in this often forgotten zone.
You Run Long, But Can’t Can Get Faster—Here’s What to Do
Stuck in a speed rut? These coach-backed tips will boost your pace.
These Glute Exercises for Knee Pain Keep You Running Strong
and buying too many houseplants. .
What to Know About Average Running Heart Rate
Experts explain what’s “normal” when it comes to heart rate while running, as well as how to use this metric to improve performance.
The Magic of the 30-Second Walk Interval
With run/walk, walk intervals are nearly all 30 seconds, regardless of the run interval time. Here’s why.
Should Runners Practice Sleepmaxxing During Their Training?
Apr 11, 2025.
10 Fun Running Workouts to Keep You Motivated Through the Winter
Apr 11, 2025.
What Is Brisk Walking and Why it is So Great For Runners
Why you should increase the intensity of your strolls and expert-backed tips for how to effectively walk harder.
The Dimensions of Wellness Every Runner Should Know
Yes, physical health is important, but it’s just one of eight pillars important for living well.
A 1-Month Treadmill Challenge to Kickstart Your Fitness Habit or Get You Back in the Game
Apr 23, 2025.
8 Running Challenges to Conquer in 2025
Everything you need to know about training in this often forgotten zone.
7 Signs of Vitamin B12 Deficiency Every Runner Should Know
May 15, 2025.
9 Signs Your Running Shoes Aren’t Working For You
What to look out for when it comes to your shoes, including obvious and subtle cues you should probably get a new pair.
6 Signs It’s Time to Switch Up Your Run Routine for Better Performance
Plus, coach-approved ways to shake up your training.
How Much Does Running Volume Matter?
Three coaches explain how to dial in this aspect of your training—and the pay off you’ll see as a result.
The Best Virtual Races With the Most Awesome Bling
If sweet swag inspires you, but you don’t want to travel to race, here is some guaranteed inspo!
Exactly Why and How Altitude Training Boosts Race Performance
Elite runners rely on this aspect of race training, but should you also consider booking a training trip?
Running Time vs. Distance: Which Is Better for Performance?
Plus, how to find the one that’s right for you.
How to Progress Your Fitness So You Continue to See Results
Stuck in an exercise rut? Understanding fitness adaptations will help you improve performance.
StairMaster vs. Treadmill: How These Cardio Machines Compare
While running outdoors is likely your preferred choice, here’s how these classic gym tools stack up.
Everything You Need to Know About Running With Knee Arthritis
Here’s how to modify your routine to sidestep pain associated with arthritis.