in mu current lifestyle as a fitness instructor, the most frequently hard used body portion is the throat and voice. maybe be you anticipated that I would say " my hardest used body portion is muscles on the legs or muscles on the lower back".
basically in my everyday work, I'm always speaking something, for example, counting the numbers in the warming up session, instructing, demonstrating, or explaining something about exercise. and when in home, I'm reading aloud some book or internet article as a practice of English language. like this, throat, vocal cord, muscles around the base of the tongue are always working. so, how to get along with the overuse of the throat, in other words, self-care of throat and voice is a very important matter to me. probably, people who are engaging in instructing, consulting, acting, singing professions are in a similar situation. in my view, the concept of " cycle training or periodization training " is applicable for recuperation of the voice and throat in these these people.