Which of the following BEST explains why the natural family planning method should be used by long-term couples only? A.
This method is the least effective method of all birth controls.
B.
This method requires the couple to be prepared for a child.
C.
This method protects against numerous STIs.
D.
This method is 100% effective if done correctly.

A. hannah wants to improve her cardiorespiratory fitness levels, so she begins to alternate running on a flat track with running up stadium stairs. this principle is known as a type b tedium c time d frequency 2. charlie is easily winded during soccer practice and wants to improve his cardiorespiratory fitness. which activity would be best for him to choose? a lifting weights b walking from one class to another c running in a 5k race d riding a bike at a leisurely pace 3. felicia just began running this past month, but since she continues to run the exact same route and exact same distance every day, she is growing bored with her runs. this principle is known as a tedium b progression c specificity d reversibility