Bumpers is the easy answer but you will need lots of them about two dozen. If you are following a training program, you will see that they use only bumpers and birds (ducks and pheasants). Dokkens, ATB flashers are subsitute for birds but very poor ones. I only use dokkens and ATB (when I am short of ducks) when doing water work as ducks don't last very long when doing water work.
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