An ultra-marathon is any race longer than the classic marathon distance of 26.2 miles. Growing ever more popular, you can do an event almost every weekend in Britain at the moment (although that's
How Youth Sports Are Organized. Most organized endurance sports have a progressive system of racing for young athletes. In XC skiing, 8-10 year old athletes typically race 1-2km, 11-13 year olds might race 2-3km, 14-15 year olds typically race 5km, 16-19 year olds might race 1-30km, and adult athletes may race anywhere from 1-50km. In