Twin studies are needed and they exist https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3893360/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3893360/ > It is con

Twin studies are needed and they exist https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3893360/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3893360/ > It is concluded that exercise attitudes and exercise behavior are heritable, that attitudes and behavior are partly correlated through pleiotropic genetic effects, but that the data are compatible with a causal association between exercise attitudes and behavior. Here are some popular articles: Does exercise really do nothing for longevity, as a Finnish twins study suggests? https://theconversation.com/does-exercise-really-do-nothing-for-longevity-as-a-finnish-twins-study-suggests-219344 https://theconversation.com/does-exercise-really-do-nothing-... >When smoking, alcohol consumption and body mass index (BMI) were taken into account in the analysis, the link between exercise and longevity was much reduced, with only a 9% difference in death rate between the least active group and others – and no difference between the highly and moderately active. In other words, for a hypothetical twin pair with very different activity levels but the same smoking history, alcohol use and BMI, there would be very little difference in life expectancy. What Happens When One Twin Exercises and the Other Doesn’t https://www.outsideonline.com/health/training-performance/twin-exercise-research-2022/ https://www.outsideonline.com/health/training-performance/tw...