Aerobic exercise uses large muscle groups rhythmically and continuously and elevates the heartrate and breathing for a sustained period. Common examples include walking, jogging/running, swimming, rowing, stairclimbing, bicycling, cross-country skiing, step and dance exercise classes, roller skating, and the more continuous forms of tennis, racquetball and squash.
Care and consideration should be used in selecting types (modes) of aerobic exercise. Depending on your goals, physical condition and injury/illness history, different types may prove to be preferential for your particular situation. However, in general, it is a good idea to "cross train". i.e., alternate between and among several appropriate exercises. This strategy reduces the chances of overuse injuries, imposes a more balanced conditioning stimulus and may enhance enjoyment. Specifically, it is important to alternate forms of high impact exercises (running, dance exercise, tennis, racquetball, squash) with low/moderate impact aerobic exercises (walking, swimming, stairclimbing, step classes, rowing, cross-country skiing). Prudent advice is no more than every-other-day for high-impact activities; perhaps less if you are overweight, deconditioned or you have an injury history or current problems with feet, ankles, knees, hips or low back.
Although aerobic exercise is not technique or concentration intensive, proper technique is still very important to optimize your efficiency and prevent injuries. The way you observe everyone else performing an aerobic exercise may not be the right way (e.g., "straight arming" and leaning over on the stairclimbing machines). Obtain quality technique from an exercise physiologist/trainer.- See more at: http://www.howtobefit.com/aerobic-exercise-principles.htm#sthash.cU4hvNyY.dpuf
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