MMT Visual Guide / Manual Muscle Testing Visual Guide in color! This printable handout can be given to students or therapists that are learning the manual muscle testing scores. This visual can be printed and laminated for daily use. MMT Visual Guide / Manual Muscle Testing Visual Guide by Kristin Carr, OTD, OTR/L Kristin Carr, OTD, OTR/L, is the owner of All About Feeding, LLC at feeding-therapy.com and a contracting Occupational Therapist for Triage Staffing. She practices in various settings,