What's 1RM?It means the maximum weight you can lift at once. · 1RM: The weight you can lift for 1 repetition · 10RM: The weight you can lift for 10 repetitionsThings to watch out for when testing 1RM· Estimating based on low repetition counts is effective. · Stop the set if your form breaks or the movement collapses. We have increased accuracy by calculating the Brzycki, Epley, and Lombardi formulas with confidence intervals that match the number of repetitions.