Hey, so I'm training my QH mare to do barrels, and I was wondering if anyone had any good exercises/drills or just tips on general, and thanks in advance for all that help!

Put in that flatwork! Avoid drilling her on the barrels- if you do the same pattern too much, she'll start to anticipate them.

I agree with everything FirstLight said, but once you have a solid start on her and want to start on barrels do a lot of slow work before you add in speed

Thanks!

Make sure you have a solid start and honestly work through the pattern at a slower speed. Work on how close she gets to the barrel and taking the shortest path to the next one. One drill that really helped my gelding and I was a drill of doing three big circles at a walk then a trot then a canter around the barrel and then three small circles around the barrel the same way. It helps you and the horse. Also I hardly ever breezed the pattern, maybe just two days or so before the events I would go to, everything else was done at a trot or canter. Also lots of conditioning! That will save you, you want your horse to be in the best shape you can get them into!