An electrocardiogram (EKG or ECG) is a test that checks for problems with the electrical activity of your heart. An EKG shows the heart's electrical activity as line tracings on paper. The spikes and dips in the tracings are called waves. The heart is a muscular pump made up of four chambers .
In the official rules for Major League Baseball, it is stated that the outfield fence should be at least 250 feet from home plate. A distance of 325 feet or more along the foul lines and 400 feet or more to center field has since become mandatory for any new stadiums.
An American football field, if the end zones are omitted, is 300 feet long. This reduces its area to 48,000 square feet, which is 1.1 acres. An acre is defined as an area of 43,560 square feet. The two end zones in football are 10 yards, or 30 feet long. Centered on the length of the field, on either side, are the coaching boxes and team areas. The coaching boxes are 6 feet from the edge of the field, 6 feet wide and 120 feet long.