I'm not going to give you a paragraph since you should do this on your own but here is a general concept...
The media makes it seem as these professional athletes didn't work their butt off to get there, most of these people did though, however, those who didn't just slacked off of other and are soon to fail in their career(s).
Answer:
smooth lining of tunica inetrna
It's based on opinion, but I would put that they won't start and get an addiction at an early age so it will be more difficult for them to start later in life.
Working the affected muscles more strenuously
I think it’s the push ups test.
Hope it helps!
Brainliest would be nice if you want to! :)