One of the most important things, of being a keeper of racing pigeons. Is observation, looking for something different happening in the loft. The birds tell you a lot, Health, Condition, love for their surroundings. This all as great effect on how they perform in racing, You have to have a quality environment, in the meaning of clean, protected from drafts but good ventilation throughout the loft. Good nutrition, fresh water, and grit and minerals.
Once you have provided all for the loft environment, your birds will tell you a lot. Returning from training or racing, its all about watching them when feeding, what are they looking for. Straight to the water on return,?
Its all about recovery after a race, good fit birds recover in time to be ready for their next race. But keep you eye out for the ones slow to recover. then you can work more on getting their recovery up to speed. It is all about working together, for your birds to show their true ability. Just my thoughts.