I am often asked after I do body work how much time the horse should have off afterwards. The answer in most cases is: None! If the horse is sound, or even rehabbing from an injury, one of the best things to do after the body has been balanced by a massage is to move. Even a long walk will help the body of the horse create muscle memory when he is moving more freely. Bad patterns created by tight muscles can best be re-patterned after a massage.
At a horse show I can pinpoint certain areas of the body to work on depending on the event. Before stadium jumping I often use the cold laser on shoulders and joints of the hind legs to enable quick response at a jump. For dressage I might focus on the muscles of the top line and haunches for maximum pushing power. Before cross country I will make sure the pectoral muscles and jaw are free to enable deep breathing. There are over 700 muscles (and that is not counting cardiac muscles, eye muscles, etc!) and releasing tight ones can hugely benefit performance.
For a nervous horse, body work can be very soothing and relaxing. For a lazy horse, he can feel free and energized after a massage session. My job is to observe reactions and adjust accordingly. I love the challenge!