The most used carpentry tool

During Summer we, my wife and I, had to do some carpentry works to ameliorate our house and I can tell you that I had to use, exactly at the same rate the screwdriver and the hammer. At the end of the day I suffered pains at muscles neither I suspected to have and it was because to use the screwdriver I had to make unusual movements in strange positions. Now, fortunately, our vacations are over and this hard carpentry work too... bye