In-line Skating

Good aerobic exercise. Inline skating burns more calories than bicycle riding and almost as many as jogging

Good form of cross-training for other sports.

According to the National Sporting Good Association (NSGA), 13.1 million people participated in in-line skating in 2006. The International In-Line Skating Association puts the number higher, at almost 30 million; half of them under the age of 14. Inline skating was the fastest-growing sport in the 90's. Half of all inline skaters were under the age of 18.