Steve I never gave it a thought that my and all the others who are birds missing from yesterday were not fit or healthy. Personally 2 weeks past, samples were taken, and sent for analysis and given a clean bill of health. As regards fitness I only lost 5 in all the training they had and none racing. They also have freedom at the loft 8 hrs daily. All were sitting eggs and motivated naturally plus I double handle all my birds and if not 100% then dont go. I cannot speak for others but am sure the quality of fanciers missing experienced birds would not be taking chances with them.