We discussed a research articie regarding PA in US adults by Tucker et al. (2011). The authors presented data about prevalence of suficient PA to meet the 2008 PA guidelines for Americans. What did their data show about the prevalence of sufficient PA? O Self-report PA data and accelerometry data showed similar prevalence of sufficient PA, O Self-report PA data consistently showed much lower prevalence of sufficient PA compared to accelerometry data O Self-report PA data consistently showed much higher prevalence of sufficient PA compared to accelerometry data. O Self- report PA data were highly correlated to accelerometry data