Question 6. Read the following selection and then answer the question. Anaerobic (literally without oxygen) exercise involves short bursts of intense muscle activity. Examples of anaerobic (or nonaerobic) exercises are sprinting, some forms of weight training, calisthenics such as push-ups and sit-ups (which usually allow rest periods between repetitions), and periodic bursts of strenuous activity in baseball and other sports (such as running to first base after hitting the ball). The intensity or all-out effort required by anaerobic activities can only be sustained for perhaps two or three minutes before muscle fatigue sets in. (Jeffrey S. Nevid, Spencer A. Rathus, and Hannah R. Rubenstein, Health in the New Millennium) The first sentence in the paragraph is a definition. The remainder of the paragraph consists of _____. examples descriptions comparisons sequences