Explain 2ways scientific ideas or scientific equipment have helped athletes gains competitive edge in the Olympic Winter Games

Cis the

Pretty sure this would be b. the rest are trick questions. the bystanders  won't go near you if u have cpr cuffs that could hurt them. the dog will back off because the sound will scare him. and the vomits just a stupid trick. if there is that much slober and vomit on the guy hes either choking on it, or just take off his shirt. 

Answergoing for a brief walk ahead of time and stretching afterward;