Exercise has long been known to boost the immune system. A new study focusing specifically on Covid-19 has now found that maximal aerobic and cardiac capacity helps prevent hospitalization in Covid-19 cases. The study, published in Mayo Clinic Proceedings on Oct. 10, is entitled “Maximal Exercise Capacity is Inversely Related to Hospitalization Secondary to Coronavirus Disease 2019.” The researchers worked on data from 246 patients who completed a clinical exercise stress test between 2016 and 2020 and later tested positive for Covid-19. Scientists looked at the relationship between maximal exercise capacity - measured during that period and before severe Covid-19 infection - and hospitalization due to the disease. Among the 89 patients in the sample who were hospitalized for Covid-19, aerobic capacity was significantly lower as compared to those who were not hospitalized for Covid-19, showing that maximal exercise capacity was inversely associated with the likelihood of hospitalization. The results of the study “further support the important relationship between cardiorespiratory fitness and health outcomes,” researchers wrote in their conclusion. The full text of the article is available via ScienceDirect at https://www.sciencedirect.com/science/article/pii/S0025619620311307