No matter what you do, you should stay at least 6 feet away from others and constantly wear a mask that covers your mouth and nose. If the exercise's intensity makes mask wearing difficult, doing that activity outdoors and away from others is especially important, the CDC has advised. Mask wearing while exercising hasn't been found to be harmful for healthy people, according to the CDC -- but those with a lung disease or heart disease should talk with their health care provider before trying to work out while wearing a mask. Virtual fitness classes are still available. But if you want to go to the gym, prepare first. Call or look online to check whether the gym is following CDC guidance for gyms, fitness centers and studios. Reserve your spot for a low-usage time and check in online if possible. Learn about practices that may affect your plans, such as closed locker rooms. Even if locker rooms are open, shower at home and arrive in your exercise clothes to avoid being close to others in a small space. Bring two masks in case one gets wet from sweat since, according to the CDC, a wet mask is less effective and can make breathing difficult.