You are studying the anatomy of the body and organs.
The answer is C)
Backflow prévention device
The answer is C because since David is going to run, and he is doing quad and hurdler's stretches, the stretch is meant to make the legs more flexible.
Yes, depending on the perspective. If it's going to be because they want you to, than no. If it's going to be a continuous thing to lose weight, get in shape, etc, than yes.
:)
