I only exercise old birds once a day, I used to feed once a day, but found the birds never exercised liked they should have as come 24hours they was hungry and that's all the birds thought about. I now still exercise only once a day, however my birds are fed twice, because they exercise of an evening they have a large breakfast, so when exercise time is due they fly with vigour. After exercise they receive a smaller portion. Young birds I train at least 3 days a week and are only fed once a day straight after training.