The best thing you can do for your good health and relief from allergies is to exercise . If you are allergic to airborne things like pollen, mold, etc., you might want to exercise indoors. Swimming in a swimming pool is a great way to get exercise plus the clorine in the water and in the air kills mold. Getting some clorinated water in your nose might sting, but it helps you some. Swimming in the ocean helps because of the salt in the water and in the air.
Salt kills mold, too.
Choose a physical activity that you enjoy and do it regularly. Unless you love calisthenics, don't choose to do them daily because you'll get bored and quit doing them. Walking at a fast pace and riding a bicyle are two excellent ways to exercise. Before doing strenous phyical activity you should seek your physician's advice. You should get competent and adequate medical treatment.