It doesn't have to be the same type of sport each day, though. Whether it be team sports or individual types of recreation, kids are just looking for fun. It's a lot easier to have fun with the proper equipment. Wearing your bicycle helmet while cycling, and shin guards while playing soccer, for example, will reduce your chances of injury. Games have a lot in common with sports, and the two sometimes overlap.
Games tend to be more recreational in nature and usually are more sedentary.
Or maybe a board game or dice game suits you better. It's fun, on a rainy day, to pull out a game you haven't played in quite some time. This is a thinking game, where you'll need to plan ahead in order to win. Figure out where the colors and shapes go on the wall. Splat the mudballs in just the right places.