uses of canter and gallop

Question
hello sir. trotting a horse would build up its muscle. then what are the uses of canter and gallop?

Answer
Trotting should be done along with galloping. Trotting is used for warm up before exercise and cool down after. Trotting is also good for maintaining a certain level of fitness, but if done too much in replace of galloping, the horse will lose fitness.