yeap I agree FH that horses can't be drilled. Even the older horses dependin on what they are doin. Barrel horses are the worlds worst for gettin burnt out on what your doin. These two new one's get about 20 to 30 minutes of ridin each day, maybe 5 minutes or so on each thing, once they do it right, she moves on to somethin else. When she's done with the "learning/teaching" part, she takes em off out thru the woods and just rides, or out in the pasture.
Same thing with a finished barrel horse...walk, trot, lope the pattern, correct anything that aint right, then quit, go for a trail ride, ride thru the cows....whatever.....just somethin that's totally different than what you were doin.
Keeps em on their toes, you on your toes, and their mind is fresh.