This is a very broad topic and has multiple approaches, as there are many protocols.  From basic chiropractic to more technical osteopathy and any number of other varieties between such as yoga, massage, acupressure, stretching.  Ultimately from my experience and outcomes the beginning point to any and all bodywork is the mouth. 

Experience has shown me that if the bio mechanics of the horse‚Äôs mouth are not functioning properly then the rest of the body will be out of balance.  The vast majority of body workers that I have had the opportunity to work with find that they can work on a horse multiple times but until the mouth is corrected and the proper biomechanics restored there the body work that is done is only a band-aid. 

Body work is a personal preference and what works best for your horse is your option.  My recommendation is find someone that is well trained, has lots of experience and is continuing their education.  Additionally, what kind of a rapport does the body worker have with your horse?  Is it comfortable and soothing, does your horse respond well or are they avoiding the techniques the body worker is using.   Ear and forelock pulling has the ability to tear nerves and cause damage.  Pulling of the tongue is also potentially very damaging.