Abstract: Digital lifestyle is a new era background for the development of national fitness. Based on the data of Chinese family tracking survey in 2010, 2011, 2014, 2016 and 2018, the double differential propensity score matching method is used to investigate the impact of digital lifestyle on the willingness of national fitness. The results show that, the digital lifestyle formed in the digital age is an important factor affecting the development of national fitness, which significantly improves the frequency of people's participation in physical exercises. And, after a series of robustness tests including heterogeneity analysis, the changed explanation variables, the exclusion of the impact of the rise of national fitness as a national strategy, and the shortened investigation time interval, this conclusion is still valid. The mechanism shows that: on one hand, the digital lifestyle enriches the channels and contents of personal learning and improves the willingness of national fitness through learning effect; on the other hand, digital lifestyle improves the willingness of national fitness by improving personal social capital.