Competitive youth sports are on the rise, says Dr. Steve Carney, a professor of sport management at Drexel University in Philadelphia. An estimated 41 million American kids play sports competitively, a significant increase in the last 10 to 20 years. Soccer, one of the countries most popular youth sports, has more than 17.5 million players. There are nearly twice as many kids in Pop Warner Football than there were 15 years ago. Skateboarding, mountain biking and snowboarding also are growing. "In just about every sport, there's been an increase," Carney said in a special report on CNN.com.