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Why are you not getting faster with Zone 2 training? If you've been running in Zone 2 for months but your pace isn't improving, your heart rate is still high, or you're struggling to run faster at a low heart rate, this conversation with exercise physiologist Dr. Juan Murias could change how you train.
Zone 2 training is often promoted as the foundation of aerobic endurance. But is running easy really enough to improve your VO₂ max, lactate threshold, and running performance—especially if you're a recreational runner training just 3–4 times per week?
In this episode of The Endurance Lab, Dr. Murias breaks down research comparing five different training intensities, from moderate-intensity Zone 2 exercise to Zone 3, threshold training, VO₂ max intervals, and sprint interval training.
One surprising finding: after approximately 6–7 weeks of training, the moderate-intensity group showed no statistically significant average improvement in VO₂ max or lactate thresholds compared with a group that did no training. Some individuals still improved, but higher-intensity training produced more consistent responses.
So does Zone 2 training actually work? Should you spend less time running easy and more time training at higher intensities? And what is the best way to improve your Zone 2 running pace without constantly pushing your heart rate higher?
CHAPTERS
00:00 Why Zone 2 Isn't Working
01:48 Understanding Training Zones
08:26 Is Zone 2 Too Easy?
11:29 Zone 2 vs HIIT
21:26 The Zone 2 Study Results
23:22 Why Some Runners Don't Improve
28:49 VO₂ Max: Which Zone Wins?
31:42 How to Improve Lactate Threshold
37:48 Does 80/20 Work for Recreational Runners?
40:17 Zone 2 and Mitochondria
47:04 Why Easy Running Still Matters
49:20 Low Zone 2 vs High Zone 2
52:03 Training Only 3 Hours a Week
1:00:07 What to Do When Zone 2 Stops Working
1:07:41 Are Your Heart Rate Zones Wrong?
