I have a 3 year old green Quarter Horse. I've been riding him consistently this Summer mostly in a round pen. No heavy work, just walking & maybe a bit of trotting here & there. He has great ground manners, easy to catch, he's been on one trail ride & he did fine except he was high energy the whole time but he never bolted/bucked/reared or spooked. He lunges great, stands for saddling perfectly, he turns very well, yields to leg pressure & he's learning neck reining. He rides great but when I point him into a field or something, he automatically gets more spirited. I rode him out on the road for a bit this morning, he walked calmly over a wooden bridge, was fine with traffic, & etc. He doesn't & hasn't tried to bolt as of yet, but he speeds up his walk, he's looking around, and trying to get him to go through a gate back to the barn to unsaddle is frustrating. He'll go right to the gate, stop, & he'll spin. I kept him there for 45 minutes today, if he tried walking off, I turned him around & kept him standing at the gate. But he refuses to go in it. Would taking him out with another horse be better for him or should I just keep working him alone in the pasture? I'm riding him twice a day (once early morning & the other late afternoon) for about 30-45 minutes at a time.