nearly a million american youngsters，some as young as 6，rely on personal trainers to shape up，lose weight or improve in sports，according to figures from the nation's leading sports club association.many parents，worried about their children's weight and fitness，say that working with a trainer motivates their kids and helps them build confidence.so they are willing to spend the $40 to $ 60 an hour that trainers generally charge. the boston－based group's latest figures，from 2005，show that 824，000 children between the ages of 6 and 17 use trainers－a figure that accounts for about 13% of t
