Active games for 10-year-olds include Snake in the Gutter and Tag. Variations on Tag, such as Tunnel Tag, are also good active games for kids.
For Snake in the Gutter, half the kids are designated as snakes. They stand in a line with wide spaces between themselves. The person in charge yells "Snake in the gutter," and the other kids attempt to run between the snakes while the snakes try to touch the runners. Any kid who is tagged becomes a snake.
In Tag, one player is the tagger. The tagger attempts to touch another player, who then becomes the tagger. In tunnel tag, players freeze when tagged, and the tagger attempts to tag everyone. Players can unfreeze tagged players by crawling through their legs.