My youngest (U11) is a "field player". In the summer time I try to let him take it easy and only do one formal session a week (we also "kick the ball" outside for fun). So in the past summers I had him either take a group class at a local training facility or an individual session from a local high school player recommended by a HS coach.
Group sessions are more fun at his age, but can be hit or miss in terms of getting better as a player - depends on the coach and other kids in the...
Group vs individual training during down time in the Summer
