2. Male body muscles account for about (40)% of body weight.

3. The number of exercises for fitness beginners is (many).

4. When learning bird training, the joint angle should be (120).

It is appropriate and scientific to practice instrument bodybuilding several times a week (7 times a week).

6. The basic substance of human protein is (vitamin B2).

7. English abbreviation of International Fitness Federation (I W F)

8. Modern bodybuilding was introduced to China in 1960s.