Estimated HRs and 95% CIs for all-cause mortality associated with levels of moderate aerobic physical activity (MPA)+vigorous aerobic physical activity (VPA) relative to less than 30 min of MPA+VPA. Results are shown stratified by muscle-strengthening activity. Density of individuals in each group of exercise are shown in bars on the lower part of the plot. CPH models allow for combinations of age, sex and race to have their own baseline hazard. CPH models control for income, education, marital status, smoking status, BMI, chronic conditions and survey year. HRs and 95% CIs are plotted on a natural log scale. BMI, body mass index; CPH, Cox proportional hazard; MSE, muscle- strengthening exercise.