Coach Herb explains how low heart rate (Zone 2/Maffetone) training helps runners—especially those over 60—run faster by strengthening the aerobic system below the aerobic threshold, improving fat burning, slow-twitch muscles, and durability so pace improves at the same heart rate over time.

The 73-year-old narrator shares that after adopting this approach post–second heart attack, his easy pace initially slowed dramatically, then his heart rate dropped at the same pace and he no longer needed walk breaks; he now has 80+ ultramarathons and age-group wins.

He argues standard 180-minus-age targets can be too low for older runners and proposes finding a “minimum viable pace” that is runnable, then setting an individualized ceiling.

Practical guidance includes shorter stride with quicker cadence drills, warm-ups, flat routes, accounting for heat/caffeine/hydration, using the talk test, accurate monitoring, monthly MAF testing, a patient 3–6 month base, and shifting to 80/20 before races, with medical advice for heart conditions/medications.00:00 Why Slow Gets Fast00:57 Low Heart Rate Basics02:29 How Aerobic Base Builds Speed04:27 Aerobic Deficiency Signs06:02 Fixing MAF for Seniors07:00 Minimum Viable Pace Method08:24 Run Slow Without Walking09:57 Five Heart Rate Stabilizers11:32 Timeline and Progress Tests12:33 Base Then 80 20 Racing13:28 Safety Notes and Wrap Up13:53 Conclusion and Next Steps

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