Critical Appraisal of Study A Study Design Validity: Muollo et al. (2019) conducted a Randomized Control Trial (RCT) to investigate the effects of exercise and diet programs in overweight individuals, comparing Nordic walking to regular walking. The study addressed a clear research question and employed the PICO framework to define it. Participants were randomized, ensuring an unbiased assignment, and the study accounted for all participants at its conclusion