It is well worth his parents while to pay for him to join an athletics club, even if only for a certain time. It will keep him off the streets and keep him fit and he will make new friends. all my children were members of a swimming club and benefited from it. One of them was national standard and was asked by the British team coach to go and live with him in the area he lived, so that he would have better access to a 50 meter pool. But bless him he wouldn't leave home at the tender age of thirteen. (We never forced him to do anything). But club membership is a godsend, if at times expensive.
They are most likely to have access to one or even several.
General Fitness training, and other Amateur Sporting information, can usually be accessed at the local Council Run Swimming Baths, sometimes the Library is a good source as well.
Probably the best move would be to contact the Club Secretary and ask for advice.
It is unlikely that anyone offers "Training Courses" as such, because there are so few individuals in any given discipline and Self Motivation is the factor which is probably the ultimate requirement of success in any of the Field and Track Events.