What
Lesson three 包含了三个文本。 Part one是一封信，咨询健身建议。 Jeremy正经历着 Health problems （ Physical problem as well as mental problem.） Part two是回信，说明 the benefits of long distance running, introducing its physical and mental benefits , as well as two tips for keeping fit.
Part three是一篇说明文 , introducing three principles of running.
Why
以网络线上咨询方式介绍跑步（ 跑步所需的设备，跑步的好处，跑步注意事项和跑步三原则。）
跑步是日常方便的一种锻炼方法，了解跑步的好处、预防运动伤害、跑步的原则，帮助学生树立健身运动的意识，养成良好的生活习惯。
How
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