CEO Michael L. Thurmond Michael L. Thurmond won a 2016 landslide victory to become chief executive officer of DeKalb County, one of the most diverse counties in the Southeast. Since his Jan. 1, 2017 swearing-in, Thurmondâs primary mission is restoring trust in county government.
9 - shoulder outward rotation in Bowfit brochure). Accessory archery muscles of the shoulder and upper body are the biceps and triceps (see figs. 10 & 11). The biceps group is responsible for flexing or bending the elbow as well as helping to lift the arm forward.They assist the posterior deltoid in pulling the drawing arm backward during the draw phase.Editor's note: The other muscle groups will be covered in upcoming articles.). The archery muscles of the shoulder and upper back are the most obvious and often the most overlooked muscles. They are not necessarily the same muscles you use every day or the ones that you might work out regularly in the gym.
Potential energy. In the case of a bow and arrow, when the archer does work on the bow, drawing the string back, some of the chemical energy of the archer's body is transformed into elastic potential energy in the bent limbs of the bow. When the string is released, the force between the string and the arrow does work on the arrow. The potential energy in the bow limbs is transformed into the kinetic energy of the arrow as it takes flight.