Sufficient condition for monotonous increase of the average fitness converging to the global maximum value is derived.

导出了选择和变异条件下平均适应度单调递增并收敛到全局最优解的条件。

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Because each person has her own physiology and fitness variations, only through running on a regular basis and monitoring your heart rate will you find the correct average that is right for you.

因为每个人都有不同的生理机能和健身需求，所以在基于一个常规标准并监测你跑步时的心跳频率你才能真正找到适合你的正确的跑步心率。

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Previous research has also shown that children's fitness is declining worldwide, including in those who are at normal weight, and is going down faster in England than the national average.

先前的研究也显示出全世界的儿童健康水平正处于下降趋势，包括那些还处于正常体重的儿童，只是英国比其他国家下降得更快。

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By alternating high- and low-intensity exercise during the same workout, you are able to exercise at a higher overall average intensity, burn more calories and improve fitness.

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