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1. hunter gatherers (n):

a member of a nomadic people who live chiefly by hunting and fishing, and harvesting wild food.

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2. Cardiovascular （adj）：

Cardiovascular means relating to the heart and blood vessels.

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3. industrialization （n）：

the development of industry on an extensive scale

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4. motor （n）:

A machine that converts electrical energy into mechanical energy to produce motion.

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5. muscle activity:

  Make muscles do more work than they are used to

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6. Chronic disease ：

one which is inveterate, of long continuance, or progresses slowly, in distinction from an acute disease, which speedly terminates.

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7. treadmill (n): 

an exercise device consisting of an endless belt on which a person can walk or jog without changing place.

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8. Squatting. (n) :

exercising by repeatedly assuming a crouching position with the knees bent; strengthens the leg muscles

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9. Tanzania （n）.

a republic in East Africa, south of the equator and on the Indian Ocean to the east

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10. Chase. (v) :

the act of pursuing in an effort to overtake or capture.

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