What I did when Pippa, my old mare, was barn sour, we did work work work around the barn. Let her learn that the barn meant work, and trails meant relaxation. I hand walked her on the trails, then when we came back i'd work work work her. I also waited a while before feeding her after a ride, so she didn't associate the return to the barn with dinner. As for during the ride, as soon as I feel a horse begin to tense, I circle the horse. Circle them whenever you feel like they want to buck, bolt, rear, etc. As for before you head off, I don't see much to do. If it's just excess energy, lunging will let the horse get out a few pre-ride jitters and bucks, but in your situation it sounds like barn-sour, so all I can say is spend more time working at the barn, less time working on the trails. Make the trails easy, and the barn hard. Best of luck to you.
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