i fly natural birds paired up all year . i don,t train much i don,t feed at same time each day.i don,t let birds out at same time each day.i do the birds to suit me birds are competitive in all races i send birds to from 60 miles to 428 miles. i got an offer from a friend years back of some dvd,s about racing systems. i said no thanks i race the kinbebothard system and i works good enough for me.