# 80/20 pace zones inconsistent with 80/20 books?

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• #19019
Martinl92
Participant

Hi,

First I would like say that I appreciate the 80/20 books much! They are informative, easy to understand and very enjoyable to read.

I’ve read most of the 80/20 books on running and found that the pace zones to some extent are inconsistent with the books.

For example, according to the books “Run like a pro”, “On Pace” and “80/20 Endurance (Coach)” the upper limit of Zone 2 aligns with VT1.
According to the book “Run like a pro”, 65% of MAS is close to VT1. But in 80/20 Zone calculator this pace rather aligns with the upper limit of Zone 1 than Zone 2?

Also in the books it is stated that “Steady state” is a pace that one can race for about 2:00h and that Zone X is “Steady state pace”.
But According to other creditable race equivalency calculators (and the 80/20 zone calculator) the upper limit of Zone X seem to coincide with about 3:30h race pace.

The lower (slower) half of Zone 3 on the other hand aligns well with about 2:00h race pace.

Can you please bring some clarity to this questions, thank you!
/Martin

• This topic was modified 12 months ago by Martinl92.
• This topic was modified 12 months ago by Martinl92.
• This topic was modified 12 months ago by Martinl92.
#19052
Leyla Porteous
Keymaster

Hi Martinl92,

Matt actually just answered a similar query in this forum post.

VT2 and 80/20 Zones

If you still have any questions please let us know.

Cheers
Coach Leyla

#19053
Martinl92
Participant

That doesn’t really answer my question.
That table is actually one of those things that I think is inconsistent with the Zone calculator (pace).

Lets look at this example.
We have a 20minute 5K (4:00/km pace) runner, he will get the following zones from the calculator.

Zone 1 5:38 – 7:09
Zone 2 4:56 – 5:38
Zone X 4:37 – 4:56
Zone 3 4:17 – 4:37
Zone Y 4:12 – 4:17
Zone 4 3:44 – 4:12
Zone 5 – 3:44

A 20:00 5K runner will have a “maximum aerobic speed” at approximately 3:40/km pace and should be able to run 30K in about 2:15h (4:30/km pace).

According to the table in Matts reply VT1 should align with the upper limit of Zone 2 (in this example, 4:56/km pace).
But if you use the formula described in “Run like a pro” to determine VT1 pace (65% of MAS) we get roughly 5:40/km pace which rather aligns with the upper limit of Zone 1.

Also according to the table, the upper limit of Zone x should be sustainable for approximately 2:00h but in this example that pace (4:30/km) would rather be in the middle of Zone 3.

^ Those questions was not answered in Matts reply in this other thread.
/Martin

• This reply was modified 11 months, 4 weeks ago by Martinl92.
#19055
Matt Fitzgerald
Keymaster

The inconsistencies are real. They’re also unimportant. Just pick a zone system and run with it, so to speak. You’ll be fine.

A Fresh Look at Intensity Zones

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