Useful guidance.
Honest trade-offs.
Training science, product comparisons, and the decisions runners actually face. We show our sources, say where the evidence is uncertain, and disclose when we have skin in the game.
The best marathon training apps in 2026
Choose by what happens after missed training, poor recovery or pain—not by how polished the first calendar looks.
Read guide →5K training plans compared: which type fits you?
Free plans, apps, watch coaches, chatbots and adaptive systems compared with a transparent method, a worked week and four disruption tests.
Read guide →Zone 2 running: find your easy effort
Why easy running builds aerobic fitness, how calculation methods compare, what the research supports and when walking is the right call.
Read guide →The best AI running coach apps in 2026
Runna, TrainAsONE, Garmin, Athletica, ChatGPT and Rayvik compared by what actually changes after a hard run, missed session or bad night.
Read guide →ChatGPT as a running coach: where it works, where it breaks
A great running encyclopedia, a risky ongoing coach. The peer-reviewed evidence, the failure modes, and how to use it well anyway.
Read guide →Runna alternatives, compared honestly
What Runna does well, why runners look elsewhere, and seven options, free ones included. One of them is ours; we flag it clearly.
Read guide →The Whoop alternative on your wrist already
Your Apple Watch measures the same signals Whoop's scores are built from. What the band actually adds, and the apps that close the gap.
Read guide →Apple Watch vs Garmin for running
Decide by software, not specs: where Garmin hardware genuinely wins, and when the features tempting you are an app problem, not a watch problem.
Read guide →More on the way: training-science guides land here under /guides, and free calculators under /tools. HYROX guides live in the HYROX hub.