Aerobic exercise is physical exercise of low to high intensity that depends primarily on the aerobic energy-generating process. “Aerobic” is defined as “relating to, involving, or requiring oxygen”, and refers to the use of oxygen to meet energy demands during exercise via aerobic metabolism adequately.
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Glorija Parker
Common cardio exercises are brisk walking, running, cycling, swimming, rowing, and cross-country skiing. In the gym, cardio machines include the treadmill, elliptical trainer, stationary cycle, stepping machine, rowing machine, and ski trainer.