ABSTRACT: Dos Santos, WM, Junior, ACT, Braz, TV, Lopes, CR, Brigatto, FA, and Dos Santos, JW. Resistance-trained individuals can underestimate the intensity of the resistance training session: An analysis among genders, training experience, and exercises. J Strength Cond Res XX(X): 000–000, 2019—Resistance training (RT) promotes improvements in healthy parameters for young to elderly adults and athleteʼs performance. Strength and muscle mass improvement are dependent on exercise intensity. This study verifies whether 53 healthy young adults underestimate exercise intensity in 3 different exercises bench press (BP), biceps curl (BC), and leg press 45 (LP). Researchers asked, “How much load do you use to perform 10 repetitions in this exercise usually in workout routines?” in each exercise. Individuals warmed up and then performed as many repetitions as possible until they reached the concentric fail. Deviations from data normality were found by Leveneʼs test; a number of repetition per exercise within gender were test by Friedman test and Connoversʼ post hoc and Kruskal–Wallis to compare number of repetitions between gender and RT experience. We correlated number of repetition and training experience using Spearman test. The number of repetitions for both groups (male and female) are greater than 8–12 repetitions for BC and LP and female BP, except for men, which perform around 8–12 repetitions on BP. Frequency of maximal repetition reached for 8–12 repetitions for women was 12% for BP, 28% BC, and 28% LP. Men reached repetitions for BP was 46.5%, BC 14.3 and LP 14.3%. Training experience did not influence the number of repetitions reached. Resistance training practitioners underestimate exercise load (56% of total sample) independent of experience. Women underestimate exercise load more than men. Based on the present results, it seems possible to state that the prescription of RT should not be prescribed considering a predefined number of repetitions, as well as a linked percentage of load, without the guidance for frequent adjustments of loads, according to the exercise performed.