A great deal of work is sedentary and most manual workexercises only a few specialized muscles.
很多工作是固着和大多数体力劳动练习只一些专业的肌肉。
2
Imagine a person who is about the right weight, but does not eat very nutritious foods, who feels OK but exercises only occasionally, who goes to work every day.
想象一个体重正常但不吃很有营养的食物的人，他感觉良好，只是偶尔锻炼，每天去上班。
3
Nelson seldom exercises because he has too much work every day.