Hi hope you try and do well. Over the years I have tried different methods be it no racing as Ybs to sending them to all the YB races right through tot he YB national at nearly 300 miles. I have sent them to their first ever race 300 miles as YBs and got them too. I never start them too early as old birds picking a week end the beginning of May. Then they can go every week or just two races inland then channel. I have sent them two 400 miles races them 660 miles all as yearlings. The only thing I can say is do not over train them before the race itself or flag them too much on the build up to the race you are calling a distance event. Do not under feed them either. I think it is SIMPLES really. not really. The best advise is to get the right birds them send them. MJB