Background <p>A previous study found a more adequate internal structure for the Baecke Habitual Physical Activity Questionnaire with 14 items (BHPAQ-14) when compared to the original version.</p> Methods <p>Healthy individuals of both sexes, either physically active or inactive, whose native language was Brazilian Portuguese and who were 18&#xa0;years or older were included. The internal structure validity was assessed by means of confirmatory factor analysis (CFA). Reliability was assessed using a test–retest model and the intraclass correlation coefficient (ICC), standard error of measurement (SEM), and minimum detectable change (MDC) were used. Internal consistency was evaluated using Cronbach’s alpha. For construct validity, the hypothesis that the BHPAQ-14 can differentiate between different levels of physical activity based on the short form of the International Physical Activity Questionnaire (SF-PAQ) was tested using the Kruskal–Wallis post hoc Dunn test. The receiver operating characteristic (ROC) curve was also employed to evaluate each domain’s ability to discriminate between physical activity levels based on the SF-IPAQ classification.</p> Results <p>The sample consisted of 246 participants. The internal structure showed adequate fit indices. The test–retest reliability was satisfactory. Internal consistency was adequate for two of the three domains (occupational and sport). The sport domain (cutoff point &gt; 2.8) showed moderate ability to distinguish between active and sedentary individuals.</p> Conclusions <p>The BHPAQ-14 is a reliable and valid tool for assessing physical activity over the past 12&#xa0;months. Its sport domain distinguishes sedentary individuals from active individuals with moderate accuracy, particularly in terms of specificity.</p>