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Sigma6
ANSWERS: 3
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Anaerobic means lack of oxygen. Your muscles are working in an oxygen deprived state. This causes your body to produce sugar-burning enzymes. You are expending energy faster than your body can replace it by metabolizing oxygen. An anaerobic exercise is any activity that fails to meet the above 4 requirements. An aerobic activity can become anaerobic if the heart rate is elevated above the training zone for a long period of time. Any start/stop activities would qualify. Examples: tennis, football, sprinting, skiing, weight training. http://www.faqs.org/faqs/misc-fitness/part1/
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The stretching, the ones that don't require the steady heartbeat increase.
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Weight training. Repeated flexing of the muscle eventually depletes the oxygen supply, and the muscle fails to support the weight. Then it's time to let that muscle rest work on another area.
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