Don't emphasize winning and losing. In fact, play some games that have no winners or losers. And when you do celebrate at the end of a game, celebrate all the participants. This summer when school is out, see that youngsters have a regular team to play on or a sport to enjoy. It's a good time to try something new.
Fishing teaches patience, karate teaches self-discipline, bowling teaches good aim and coordination.
Sometimes nearby golf courses will have youth introductory classes. Pools have lessons in swimming and water polo. Try archery, gymnastics, fencing, handball. Many games can be played at home. A ping-pong table in the garage is good exercise.