Alan Couzens

Alan Couzens

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Physiologist/coach; data-driven performance, HRV, and endurance modeling.

Race Specialty Dictates Training Focus: Sprinters vs Distance
SocialApr 23, 2026

Race Specialty Dictates Training Focus: Sprinters vs Distance

Thanks @lupinrider 🙏 I think the races/events that the athlete is good at offers a lot of info - both on how they should train late in the build and what race they should be focused on at the end of...

By Alan Couzens
Volume Sets Your Performance Ceiling, Not Sharpening
SocialApr 23, 2026

Volume Sets Your Performance Ceiling, Not Sharpening

I agree with @zbitter - this is how it should be done... 1/ Build volume (6+ mo) 2/ Sharpen for a race (2-4 mo) 3/ Recover (1-2 mo) 4/ Build to a higher volume. The problem comes when time-limited athletes stop at phase 2 and...

By Alan Couzens
Increase Training Volume for Sustainable Performance Gains
SocialApr 23, 2026

Increase Training Volume for Sustainable Performance Gains

Your training volume sets your performance limit. Sure you can do intervals for a couple of months to get a temporary boost. But, for lasting, sustained improvement, the only way forward is to figure out how you can do (and absorb) more.

By Alan Couzens
Tailor Your Training: Athlete Types Guide Updated
SocialApr 22, 2026

Tailor Your Training: Athlete Types Guide Updated

Updated my latest article on "What Type of Athlete Are You?" I wasn’t satisfied with just explaining the athlete types… So I added a NEW section on how to actually adjust training for each one... - What to emphasize through the season - How...

By Alan Couzens
Consistent Easy Miles Beat Intervals for 5K Success
SocialApr 22, 2026

Consistent Easy Miles Beat Intervals for 5K Success

I dunno, man... If you're say a 20 minute 5K runner doing 30mi/wk w/ 2 specific interval workouts/wk. You drop the interval workouts for a year and commit to building to consistent 60mi/wk of *only* easy miles plus strides. Then run a...

By Alan Couzens
Nature Syncs Our Heart Rhythm, Boosting Health
SocialApr 22, 2026

Nature Syncs Our Heart Rhythm, Boosting Health

Something we overlook… Our body is constantly syncing with our environment. Every time I’m by the ocean, my #HRV starts to mirror the waves. Maybe better health isn’t another intervention… Maybe it’s reconnecting with nature. 🌊 https://t.co/x5xbhjlner

By Alan Couzens
No Speed Without Mileage: Denial Won’t Boost 5Ks
SocialApr 21, 2026

No Speed Without Mileage: Denial Won’t Boost 5Ks

Thinking you can run fast in anything 5k or more without putting in serious time/mileage is bathing in a river called denial.

By Alan Couzens
90% of Fitness Gains Come From Pure Base Work
SocialApr 21, 2026

90% of Fitness Gains Come From Pure Base Work

(Sadly) leaving ice cream metaphors behind, the number is ~90/10. That is, you'll get ~90% of your fitness potential from pure base *work* (sub LT1) You'll get ~10% by adding "the fancy stuff" More concretely, your typical runner with the potential to run...

By Alan Couzens
Your Training Plan Should Fit You, Not Be Universal
SocialApr 20, 2026

Your Training Plan Should Fit You, Not Be Universal

The right training plan is like the right relationship… There’s no universally “perfect” one. There’s just the one that perfectly fits you.

By Alan Couzens
Amateurs Train by Time, Pros Train by Calories
SocialApr 20, 2026

Amateurs Train by Time, Pros Train by Calories

The key question for an amateur endurance athlete: "How much time do you have to train?" The key question for a professional endurance athlete: "How much food can you eat?"

By Alan Couzens
No Such “Magic” Workout Ratios—Just Personal Preference
SocialApr 19, 2026

No Such “Magic” Workout Ratios—Just Personal Preference

If you believe in & want to argue for "magic workouts"... Like 45/15 is somehow special & universally superior to 30/30 or 20/40 or 15/45 or 180/180 or 3000/300 or any other possible interval permutation... Please let me know so I...

By Alan Couzens
Monitor Heart Rate: Ignoring It Leads to Bad Outcomes
SocialApr 18, 2026

Monitor Heart Rate: Ignoring It Leads to Bad Outcomes

This is exactly why you *should* pay attention to heart rate. A lot of variables beyond the pace/power you're pushing go into the mix to determine physiological stress at any point in time. You can't ignore those variables. I mean, you can, but...

By Alan Couzens
Lower Resting Heart Rate Lets You Work Harder
SocialApr 18, 2026

Lower Resting Heart Rate Lets You Work Harder

One thing I like about a fixed HR cap... It naturally grows with your fitness. 120 bpm is a much higher relative effort for someone with a resting heart rate of 40bpm, than it is for someone with a resting heart rate...

By Alan Couzens
Walking Reduces Calorie, Hydration, and Heat Limits
SocialApr 18, 2026

Walking Reduces Calorie, Hydration, and Heat Limits

95% Calories, fluid & heat management are 3 of the biggest limiters to marathon performance. All go down a lot easier when walking.

By Alan Couzens
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