How often should runners re-estimate the 1RM?
Every 4–8 weeks, or after any block where strength visibly jumps. More often than that and you over-react to noise.
1RM Calculator for runners
runners program around a working 1RM, not a tested one. This page returns Epley and Brzycki estimates from any submaximal set, picks the conservative number for programming, and shows the standard 60–95% table so runners can plan main and accessory work without burning energy on fresh maxes.
Why estimates suit runners
Sport schedules rarely allow regular 1RM testing — the cost in recovery and injury risk is high, and the benefit over a clean estimate is marginal. For runners, the rep-to-1RM formulas give programming-quality numbers from sets you were already doing.
Take the lower of Epley and Brzycki when in doubt. Conservative loading protects training continuity, which compounds far more than an extra 5 kg on paper.
Programming percentages for runners
60–70% builds work capacity and hypertrophy. 75–85% builds strength. 90%+ is for peaks or testing windows only. runners cycle through these bands rather than living in one, with the lower bands supporting more total volume.
Re-estimate every 4–8 weeks using a clean 3–5RM. Maxes from 8+ reps drift further from reality.
How AJYX manages 1RMs for runners
Inside AJYX, your 1RM updates automatically from heavy sets and RPE inputs. The app loads the bar for runners so you train at the right intensity without doing the maths in your head between sets.
Use this page as the standalone read. Move into the app once you want training loads managed by data instead of by feel.
FAQ
What rep range gives the most accurate 1RM for runners?
3–6 reps near failure. Below 3 carries more risk; above 6 the formula error grows.
Should runners use the higher or lower of the two formulas?
The lower one for programming. The higher one is fine as a personal-best reference but should not drive heavy work.