Most runners are training in the wrong zone — and it’s costing them performance. Here’s how to accurately find your lactate threshold and fix it.

In this episode of Run Smarter with Coach Justin, I break down how to measure your true threshold intensity using a simple 20-minute test — so you can stop guessing and start training with purpose.

You’ll learn:

• What lactate threshold really is (and why it matters)
• Why heart rate formulas like 220-age are often wrong
• The best way to measure your threshold without a lab
• How to calculate your Functional Threshold Heart Rate (FTHR)
• How to match heart rate and pace zones correctly

This is the foundation for smarter training, better pacing, and improved performance from 5K to marathon.

👉 Subscribe for the next episode where we break down the 4 key threshold workouts every runner should use.

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