YBs not flying.....???

let my ybs out twice a day for exercise but they only fly for about 10 mins then land, they are panting as tho they have flown a chanel race............the birds have never been off ranging but all they seem to do is fly in tight circles around the loft at a very fast pace, they are like rockets round and round and round........???


any thoughts anyone ?

spoke too soon, today they flew better than they ever have, over half hour this morning and same tonight.............i know its not much but its a step in the right direction its took weeks to get them even this far so next step is training