12. balance is:

a. the ability to maintain control of your body while stationary or moving.
b. the ability to combined strength and speed in activities such as throwing and jumping
c. our ability to use the senses to produce accurate movements
d. the ability to change direction of your body quickly.

13. progressive weakening and size reduction of muscle tissue, which is usually the result of disease or disuse, is called:

a. atrophy
b. overload
c. specificity
d. hypertrophy

14. the term duration refers to:

a. how often you exercise
b. how hard you exercise
c. how long you exercise
d. how intese you exercise