Before you get a pain in your neck, your lower back starts bothering you or elbow starts aching, you might want to consult the Motion Doctor. Motion Doctor is like having a physical therapist in your iPad. The app was created by a Pennsylvania physical therapist, Desirea D. Caucci, as a way for people to avoid motion injuries. It can also be used as a tool by physical therapists to illustrate exercises they’d like patients to do at home. The app uses a combination of video and text to describe routines for strengthening and stretching parts of the body.