Abstract: This invention relates to a foot testing method to analyze the functional biomechanic type of the foot of a person such as an athlete to determine the appropriate insole to be fitted in the person's shoe as well as to a measuring device and insole used to implement this method. This method comprises the following steps: (1) placing the foot in a neutral (unloaded) position; (2) identifying the center line of the heel bone; (3) identifying the center line of the tendo Achillis; (4) placing the person tested in a standing position and preferably identifying the type of arch; (5) measuring the angle between the heel bone center line and the tendo Achillis center line preferably with his/her knees bent at approximately 45.degree..