Most runners train to improve their lactate threshold. But what if improving it is actually making you slower? In this episode, I sit down with Dr. Peter Tran — sports medicine PhD, 1:14 half marathoner, and co-founder of Athyx — to break down everything runners over 40 need to know about lactate, how to actually use it to guide training, and why most of what you've heard about lactate threshold training is wrong.

We also get into fueling strategies, the truth about high carb versus low carb for endurance athletes, and the future of continuous lactate monitoring — including Peter's new wearable device that could change how runners train forever.

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0:00 Why lactate matters

4:39 LT1 and LT2 explained

11:22 Lab vs real world testing

17:52 Maximal lactate steady state

24:11 Using lactate to guide training

29:48 One test tells you nothing

32:06 Shifting the lactate curve

36:29 Lactate data over time

39:42 Lactate vs heart rate

45:04 High carb vs low carb and lactate

50:46 Continuous lactate monitoring

56:15 Athyx Flux One

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