The Tableau dashboard below collects data from marathons, tracks the number of finishers who meet their Boston qualifying time, and projects an estimated cutoff time for the 2026 Boston Marathon. It will be updated regularly throughout the year, through the registration period in September 2025. For more details on the data, the assumptions, and other … Read more
When I ran my first marathon — Atlantic City, 2021 — I didn’t know much about this whole world of marathon running. But as soon as I finished, I was hooked. I sat at the beach bar, recovering from the race with a nice cold beer, Googling and planning out my next steps. What should I run … Read more
Recently, the BAA released the field of entrants into the 2025 Boston Marathon. On the website, you can look up an individual runner or search for filtered groups of runners. The data includes their bib number, wave, corral, name, age, city, state, and country. For some reason, the current list does not include gender. Last … Read more
Towards the end of last year, a group of researchers published a study based on a large sample of runner’s Strava data: The Training Intensity Distribution of Marathon Runners Across Performance Levels by Daniel Muniz-Pumares et al. I saw this article shared in a couple subreddits, including r/Marathon_Training. I’m pretty sure there was a thread … Read more
Last weekend, I ran the United NYC Half Marathon. The rest of the week was focused on recovery, and everything went to plan. At the end of the week, my legs felt great. My speed was back. And I was ready to attack these last couple weeks of training. Usually, I’d try to work in … Read more
Feature photo by Naoki Nakashi on Flickr – CC BYSA 2.0 It’s been a couple of weeks now since the Tokyo Marathon. I wrote up a general analysis of the data from the race, and I followed that up with an exploration of how the field varied throughout the corrals. But that preliminary data was … Read more
I guess the title of these posts will now become, “JC Marathon Training.” Because this week was the United Airlines NYC Half – and it’s officially in the past. Despite the crumby weather, it was a great race and a fun time. I came up a little short of my goal, but I’ve got no … Read more
This weekend, I ran the United Airlines NYC Half Marathon. I applied through the lottery for this race last year, and I didn’t get in. I did get into Brooklyn, and I had a blast there. I had lofty goals of hitting the 1:25 time qualifier for the NYC Marathon, but it wasn’t in the … Read more
Feature Photo by Quino Al on Unsplash If you were to ask which marathon training plan is the most popular, I’d probably say Hal Higdon. He is frequently recommended on r/Running and r/Marathon_Training to new runners, and when you look at the Google Search data people look for information on him much more frequently than … Read more
Feature image by Dietmar Rabich on Wikimedia Commons – CC BY-SA 4.0 Time flies, and just like that we’re it’s almost time for the United NYC Half Marathon. Seems like just yesterday I was running Fred Lebow – and March seemed a far way off. This training block started off slowly. The first couple of … Read more
Feature image by nakashi on Wikimedia Commons – CC BY-SA 2.0 Last week, I published an analysis of the 2025 Tokyo Marathon and shared some insights from the data. I collected the preliminary results, including some demographic data and finish times, and came to three general conclusions: This analysis prompted a decent amount of discussion, … Read more