that depends...if your horse is trained, and it depends on the way they were trained.....but generally you just cluck you tongue or use your knees to squeeze. good luck!
To slow your horse down lean back into your seat bones and squeeze your fingers. When you lean back though make sure your legs don't go forward that will lose your balance.
Well, you need to begin by making sure you are comfortable and collected at the walk and trot before you attempt to canter, but when you do, if you want to ask for the left lead (cantering to the...