The US Centers for Disease Control and Prevention's (CDC's) latest snapshot of arthritis prevalence, severity, and related physical inactivity reported in 2017 looks a lot like its previous one, based on 2015 data. As then, an estimated 1 in 4 US adults have the condition, almost 27% of whom experience severe joint pain. Making matters worse, says CDC, of those with arthritis, around a third report that they don't engage in any physical activity, the very thing that "can improve physical functioning in adults with joint conditions."