Updating Marathon Cohorts
Marathon Cohorts shows what training runners in your goal time cohort are doing. We've updated it with 3rd-degree polynomial smoothing for smooth, monotonic curves.
Kailo Notes
Where we talk about data and science meeting fitness.
Building an Activity Feed
A look at how we optimized our activity feed to load 2000+ activities in just over a second.
The Science Behind Marathon Taper
How long should you taper? We analyzed a study of 158,000 marathon training cycles to find out what actually works. Evidence-based guidance for your final weeks before race day.
Will You Qualify for Boston 2026?
Wondering if you'll make the Boston cutoff? We analyzed the 2025 buffer to help you understand what it takes. Whether it's your first attempt or tenth, we've got you.
How Altitude Affects Your Marathon Prediction
Training at elevation changes everything. Learn how Kailo accounts for altitude to give you more accurate predictions, so you know exactly where you stand.
Boston 2025 Qualifying Standards
Understanding Boston's qualifying buffer helps you set realistic goals. Our analysis breaks down what times actually got accepted, so you can plan your race strategy.