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Brian Rock

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Brian Rock

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Nov 29, 2025

How Common Is a Sub-3:00 Marathon?

Diving deep into the data to see how many runners finish under three hours

How Common Is a Sub-3:00 Marathon?

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Jan 31, 2024

How Do You Compare Race Results Between Age Groups?

The promise of and problems with the age grading system

How Do You Compare Race Results Between Age Groups?

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Aug 24, 2023

A Deep Dive Into Marathon Data

Recently, I saw a post on Reddit the sparked some great conversation. Have marathoners really gotten slower over the last twenty years?

A Deep Dive Into Marathon Data

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Sep 6

2026 Sydney Marathon By the Numbers

In its second year as a Major, how is the race changing?

2026 Sydney Marathon By the Numbers

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Brian Rock

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Aug 2

Which of the Majors Have the Fastest Age Group Winners?

It might not be the race you think it is

Which of the Majors Have the Fastest Age Group Winners?

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Jul 25

What Are the Odds for the Boston Marathon’s New Lottery?

Missing the cutoff is no longer pure disappointment

What Are the Odds for the Boston Marathon’s New Lottery?

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Brian Rock

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Jul 12

Are Women More Likely to Pace Marathons Well Than Men?

Analysis of results from Berlin and critique of a new research study

Are Women More Likely to Pace Marathons Well Than Men?

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Brian Rock

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Jun 30

The 2026 Grandma’s Marathon by the Numbers — Running with Rock

I usually reserve these deep dives for the Majors and a handful of other really big races. While Grandma’s Marathon is a big race, it’s not…

The 2026 Grandma’s Marathon by the Numbers — Running with Rock

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Jun 21

Boston Conversion Rate Revisited: Do Sydney Runners Apply to Boston?

Has anything changed between the 2025 and 2026 Boston Marathons?

Boston Conversion Rate Revisited: Do Sydney Runners Apply to Boston?

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Brian Rock

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Jun 14

What the Presidential Fitness Test Can Tell Us About How Fast Normal People Can Run

The average person may be faster than you think, at least back in 1985

What the Presidential Fitness Test Can Tell Us About How Fast Normal People Can Run

Brian Rock

Brian Rock

I'm an avid runner, focusing on longer distances like the marathon. I also enjoy being out on the trails, walking my dog, and making beer. And I'm a data nerd.

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