The aims of this study were: (1) to report on and analyse rest interval (RI) control between sets adopted by resistance training (RT) participants; (2) to evaluate how RT participants control RIs; and (3) to describe the factors associated with controlling RIs, such as, gender, RT experience, and professional guidance. Four hundred and fifteen volunteers (198 women and 217 men) answered a questionnaire about RI control. Among the participants, 89.9% (n = 373) reported receiving guidance during physical training, of which 74.5% (n = 278) received instruction from a sports and exercise professional. The proportion of subjects that reported controlling RIs was 71.6% (n = 297). Most subjects that reported controlling RIs (95.0%, n = 282) reported adopting an RI of 60 s or less. There is no association of RI control with gender and professional guidance. The RI adopted by most of the participants might be considered short (<60 s), which is not in line with most RT guidelines. The results of the current study could be used to improve attitudes toward RT.