In the evaluation of neuromuscular diseases (NMDs), assessment of muscle strength is among the most important tools for diagnosis. Manual muscle testing (MMT) is the test most frequently used in the clinical setting. Instrumental measurements are also used but special equipment is needed. For MMT, several scales can be used but the normal MRC (0–5) and its expanded version (0–10) are the most widely utilized. Results are expressed in numbers. One of the first clues for diagnosing a specific NMD is the recognition of the pattern and distribution of muscle weakness. The use of visual aids such as shape and color can greatly assist in the interpretation of the findings and enhance the clinical understanding of each case. Color provides an important dimension in visual communication and can greatly enhance the effectiveness in the perception of muscle weakness. We have developed a color scale to illustrate muscle weakness that matches the expanded MRC scale, going from blue (10) to black (0). The colors are transferred automatically to a human silhouette by means of a software application so that the individual muscles or muscle groups are individualized. The system allows recognition of different patterns of muscle weakness and of individually affected muscles at a glance, providing a new tool for communication, reporting and teaching. It is also very useful in the follow up of individual cases. Examples of this new tool and its applications are presented, and potential uses in the study of NMDs are analyzed.