For health care it is best to be provided with research papers which are the most accurate place to find information: PubMed and Nature magazine can be two choices you can research things without worrying about reliability
Answer: He should of used the heel of his hand instead of using his fist.
Explanation: Using the heel of your hand is better than using your fist while doing a compression because this allows you to apply more pressure.
Static stretching is Dynamic stretches are controlled movements that prepare your muscles, ligaments and other soft tissues for performance and safety. Static stretches are those in which you stand, sit or lie still and hold a single position for period of time, up to about 45 seconds.
B. Assuming and holding a stretch position
Answer: What are ranges?
Explanation: Sorry I don't know what this is