Robert G. Ingersoll (1833 - 1899) The ozone layer plays an important role in the atmosphere. It protects life on earth from the full force of the sun's cancer-causing ultraviolet radiation. However, many household products and appliances release substances to the atmosphere that causes the hole in the ozone layer.
Main Muscle: 1  Begin in a standing position with a dumbbell in each hand. 2  Initiate the movement by flexing the elbows to curl the weight. 3  Execute the pressing movement by extending the arm, flexing and abducting the shoulder to rotate the arm as you press above your head.
Push ups work a number of the muscle groups of your upper torso. The following muscle groups are trained when doing push ups: 1  Pectoral muscles. 2  Triceps (back of the arm).3  Biceps (front of the arm). 4  Front and rear heads of the deltoids.he short answer to the question, what muscles do push ups work is that they work the muscles of your upper torso. This is a simplification however. The muscles of your upper torso include the following: 1  Pectoral muscles (pectoralis major and pectoralis minor).