To correct a herbound horse, first understand your gelding's survival instincts. Your horse is a prey animal and a herd animal. Whenever you're with your horse, you make up a herd of two; you have to become the leader of the herd. Your gelding is deriving his security from the other horses on the trail, not from you.
Teach your horse that you’re in control in every area, on the ground and in the saddle. When you're in control, your problem with her speed will be solved. Start by building a strong foundation on the ground, then you'll carry over this training to under-saddle work.
When weather prohibits long trail rides or outdoor training sessions, indoor excercises can be helpful in creating a bond with your horse. Picking up his feet, grooming and longeing are just a few of the things horse owners can do to increase a bond with the horse.