Mixing exercises cuts mortality in 100K study
- A BMJ Medicine study from Harvard researchers reported that adults who regularly did more kinds of exercise had lower mortality than single-activity exercisers. - The analysis followed 111,467 U.S. adults for more than 30 years and found the highest activity-variety group had 19% lower all-cause mortality. - The paper adds variety to exercise advice built mostly around volume alone. (bmjmedicine.bmj.com)
Exercise advice usually focuses on minutes per week. This study found the mix of activities also mattered for how long people lived. (bmjmedicine.bmj.com) Researchers at Harvard T.H. Chan School of Public Health analyzed data from the Nurses’ Health Study and the Health Professionals Follow-Up Study, two long-running U.S. cohorts. The paper was published January 20, 2026, in *BMJ Medicine*. (hsph.harvard.edu) (pmc.ncbi.nlm.nih.gov) The analysis included 70,725 women and 40,742 men who were free of major chronic disease at baseline, with physical activity updated every two years. Over 2,431,318 person-years of follow-up, 38,847 participants died. (pmc.ncbi.nlm.nih.gov) Participants reported time spent walking, jogging, running, cycling, swimming, rowing or calisthenics, racket sports, weight training, yoga and stretching, yardwork, and stair climbing. The researchers counted “variety” as the number of different activities people kept doing over time. (hsph.harvard.edu) (pmc.ncbi.nlm.nih.gov) People in the highest variety group had a 19% lower risk of death from any cause than people in the lowest variety group, even after accounting for total activity. Cause-specific mortality was also lower, with reductions ranging from 13% to 41%. (pmc.ncbi.nlm.nih.gov) The paper also looked at individual activities. Compared with the lowest participation levels, the highest categories were linked to lower all-cause mortality for walking, jogging, running, cycling, racket sports, stair climbing, rowing or calisthenics, and weight training. (pmc.ncbi.nlm.nih.gov) Swimming was the exception in this analysis, with a hazard ratio of 1.01 and a confidence interval that crossed 1.0, meaning the study did not find a clear mortality advantage for that activity alone. The authors reported non-linear dose-response patterns for total activity and most exercise types. (pmc.ncbi.nlm.nih.gov) The study does not prove that variety itself caused longer life. Exercise was self-reported, and the cohorts were made up primarily of white health professionals, which the authors said could limit how broadly the findings apply. (hsph.harvard.edu) (pmc.ncbi.nlm.nih.gov) What it does show is narrower than “do everything” and broader than “just do more.” In these two cohorts, people who kept up several kinds of movement over decades had lower mortality than people whose routines were less varied. (pmc.ncbi.nlm.nih.gov)
