I have an 4 year old horse, Gunther, he just started under saddle when he was 3 and took a break during the winter but now I'm putting him on a schedule of riding at least 4 times a week.
To help get his extra energy out and warm him up before I ride, I lunge him beforehand for at least 10-15 mins (sometimes even more). Gunther is fine when doing circles and is relaxed but riding in a straight line, unless pooped out he always gets excited and tries to trot, canter and does a little buck once in a great while.
I'm not afraid of him doing this but it's a horrible vice to learn, him thinking he can trot when he wants and that I'm not in control. I know he's still young but how can I get him to just slow down and listen to me? We do practice out circles all day but I'm posotive it gets boreing to him.