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Our purpose was to examine possible influences of age on resistance exercise (RE) intensity progression in men. Twenty-four men, divided in young sedentary (YS; n= 10; 25.9±3.7 years), older sedentary (OS; n= 7; 67.4±5.2 years), and older runners (OR; n= 7; 71.3±3.0 years), underwent a 2 times-a-week RE program for 13 weeks. Muscle strength was assessed before and after training by 1-repetition maximum test. RE workloads were recorded for each exercise session, and increases of 5–10% were made whenever adaptation occurred. Muscle strength improved similarly in all groups after RE (P< 0.001). Relative RE intensity progression was not significantly different between YS and OS, except for a greater increase in calf raise relative workload observed in YS (P< 0.05). In contrast, OR displayed greater relative workload increase in 7 and 6 exercises than YS and OS, respectively (P< 0.05). The RE was safe …