Using data from NHIS from the years 2017, 2015, and 2013, I use OLS regressions to investigate the relationship between activity frequency, duration, and type of exercise (moderate, vigorous, and strength activity). I find that when controlling for variables such as sex, age, smoking status, mental health status, and insurance coverage, activity level is not consistently correlated with annual healthcare cost. The effects of exercise are complex but have implications for individuals’ healthcare costs, government programs, and the insurance and fitness industries.