INTRODUCTION

Modern science has developed many new exercises that aide in improving physical fitness. Consequently we have forgotten about less technical activities such as the push-up. Push-ups can be included in a daily exercise regimen. They are easy to perform at any location and require no costly equipment. In this experiment we will evaluate two different styles of push-ups, regular and knee push-ups. Regular push-ups are performed on hands and toes and knee push-ups are performed on hands and knees.

Our purpose is to determine which style of push-up exerts more load on the glenohumeral joint. We will be measuring joint angles and calculating the forces created by the mass of the body. The movement will be recorded in sagittal plane using a video camera. The entire body and ground will be filmed. Joint markers will be placed at selected joints and used for calculations. The motion examined will be one complete push-up.