Getting enough exercise becomes more important the older that you get. Unfortunately, only about 1 in 10 Australians over the age of 50 exercises enough to gain any type of cardiovascular benefit from the exercise. If you want to get out of a rut and exercise more, take up tennis. This sport will exercise all of the muscles in your body and can be enjoyed with a friend or two. Installing a tennis court at home can further your commitment to exercise more regularly.