Running has a lot of advantages. First of all, you don’t need anybody else to do it, and no need for special equipment. You don’t have to go to any special place to do it. As long as you have running shoes and a good road you can run to your heart’s content. Tennis isn’t like that. You have to travel to a tennis court, and you need somebody to play with. Swimming you can do alone, but you still have to go to a pool.
