How do you excersise horses without riding them?

I'm no expert, So I don't know all the names, but one of the easiest things to do is to let your horse out in to a large field. this will give them enough room to exercise without even realising it lol. Or you could run along side your horse, holding the lead rope. or I know you can get these really long lead ropes that allow you to control your horse whilst giving them enough freedom. Basically you just stand in the middle of the field or whatever, and turn on the spot, as your horse trots/canters around you. Or you could just get someone to ride it for you :) hope this helps x