I’ll give you two sides to this one! I believe they can be a wonderful tool for both the client and the trainer, as long as the client wants to take that approach to track progress. Pictures can be a powerful motivator and one measure of the client’s success. In general, images are a powerful marketing tool that capture attention. Doesn’t a picture capture your attention more quickly than just words on a page? In addition, some potential clients may associate a trainer’s success with those before and after images.
However, I feel that those types of pictures are only one small piece of success for both the client and the trainer. There is so much more that goes into personal training, and some success cannot be documented with pictures. More energy, increased stamina, less pain, less stress, increased range of motion and activities of daily living–all are successful outcomes that may not necessarily have a before and after picture. The long-lasting benefits of health and fitness are more important.
Hope this helps!