How does the centers for disease control and prevention promote health?

What component of fitt refers to the duration of a single workout?

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

Describe the concept of interval training. what is the benefit of this type of training?