Keep the pace slow. A walk or trot is sufficient. You are not going to punish the horse by running it out of air or energy. Horses learn more quickly when they are not stressed. Watch your horse's sweat and breathing patterns.
Horses sweat first behind their ears and last on the top of their croup.
They pant when they are out of air. Stop and take a rest before your horse becomes too sweaty or begins panting. The body bubble is an energy field radiated out of the animal that allows it to become aware of, and react to, touch stimuli before the skin is actually touched. To move or stop the horse, project your body bubble as energy toward the horse. If you step toward the shoulders while projecting your energy, the horse will wheel its forequarters away from you and present its hindquarters, the hindquarters will move away and the horse will tend to look in.