I believe that the function of having the clients able to view their progressional charts for the different exercises/ lifts would be useful for them to keep track of their progress. From what I understand, the trainer/ coach has to do a screenshot and share it to them, or send it as a PDF. This can be time-consuming especially if you have many clients under your belt. I feel that having the progressional charts for both parties would help to increase the efficiency of the coaching.