Hi Dr. Will. Great content! I did the 30-minute lactate threshold (LTHR) test on a dirt track on a stadium. I went all out and used my Stryd Gen2 power meter's watts to ensure even pacing. I have to say that my Stryd did an outstanding job at predicting my average watts as well as my finishing time - it was 99% accurate. I averaged 3:59min/km and 179bpm for the whole run (7.53km) and 4:01min/km and 180bpm for the last 20 minutes. My maximum heart rate during the run was 187bpm and I'm 39 years old. I used a Polar Verity Sense optical HRM which is as accurate as an ECG strap. If we calculate my zone 2 range to be 80-90% of my LTHR, then it falls between 144 and 162bpm and I can say that beyond 155bpm, my running feels anything but not challenging aerobically. I find it somewhat hard to believe my LTHR is 180bpm. Do you see any issue with such numbers? Also, does your Run Faster With Data - Everything You Need in One Place course cover all of this theory so I don't have to watch all of your podcasts and KZfaq videos? This isn't to say that I don't want to process other materials. In fact, I've watched half of your KZfaq videos already, it's just that I prefer to truly have everything in one place.

another excellent video & explanation, thanks.

I have the same heart rate on a spin bike of 150 pedaling fast on low resistance, and pedaling slow on high resistance. How does the heart behave and adapt differently with low resistance versus high resistance?

When calculating with Freid my zone 2 is only 138-147. Feels like a very small range when targeting zone 2 right? When using MAF my treshold is 145 and below. Would you say is a problem running at 120-140 range on my long zone 2 runs? As the Freid calculator is very narrow I mean...🙄 Thank you for very good content !!

I work as an Exercise Physiologist, and have a friend who has a masters in Exercise Phys as well. This absolutely makes the most sense for a running context I’ve ever heard. Thanks Dr. Will. Question about the lactate threshold training. I’ve been doing one threshold session on the bike to limit msk/eccentric effects, and one threshold session outdoors for a running workout. Is this an effective base building strategy so I can focus more time on zone 2 running, with no races on the immediate horizon?

Do you use fat the same in Z1 or Z2 when taking on carbs during exercise? Does taking gels negate the body utilising fat?

Which devices are you recommending for athletes to use? Can the Edge produce equal results to the Lactate pro2, Lactate Scout 4 and Lactate Plus?

Really enjoying your videos Dr Will! I've heard LT threshold referred to as "1 hr pace". Can you explain how using average pace for the 20 min test, or last 20min of 10k is accurate for threshold pace? Wouldn't both of these methods be significantly faster than 1 hr pace (as well as different to each other)?

I am about to take a week off from trying to go faster than my fastest mile of six minutes and forty seconds and what I am about to do over this off week is continue to get on the treadmills, this time going slow (just a bit faster than twelve minutes a mile pace if even that). I am looking for a slow jog that I can keep doing for fifty minutes straight, apart from warm ups and cool downs, and never enter that sub threshold heart rate zone. I just want to take this easy (zone 1 and zone 2) for an hour a day on the treadmill for at least one week, then a week later, I can try running fast again. I may still be training for a sub six minute mile, but I do not always feel like running fast, only sometimes and sometimes, I would rather run slow.

Where is his calculator that he mentions?