Exercising outdoors and avoiding large groups of people is preferable, especially if you are not yet fully vaccinated for Covid-19. — TNS Dear Mayo Clinic: I am in my early 40s. During the Covid-19 pandemic, I didn’t get as much exercise and I gained some weight. I now feel like I have less energy. I was previously infected with Covid-19. Is it safe to start exercising again and should I wear a mask? ANSWER: Regular physical activity and structured exercise can benefit people of all ages and physical abilities. These benefits include improvements in overall health, fitness and quality of life, as well as a reduction in the risk of chronic conditions such as heart disease, type 2 diabetes, dementia and certain types of cancer.