For burning off excess adolescent energy, you can't beat sports. Fortunately, there's a wide range of sports year-round for boys and girls. Many can be adapted to include kids with disabilities, too.
What might interest tweens the most about sports is that each new season brings the opportunity to try a different activity. Both team and individual sports help build strength, confidence and sportsmanship. Look for programs through your child's school, your local parks and recreation department, or the YMCA.