Derek is a gymnast, and his favorite event is the rings. To score well, he is required to hold a position for several seconds before continuing into the next move. In his favorite move, he performs shoulder abduction to form a "T" and then holds it without moving. While Derek is holding this position, what type of contraction is his deltoid performing?

Need 5. reflection what factors did you use to determine the validity of your sources? (what was most important and guided your decision to determine validity? ) what factors did you use to determine the reliability of your sources? what was the most important and guided your decision to determine reliability? what form of media resources (internet, publications, music, advertisements, video, etc.) do you think were the most valid and reliable for your question? support your answer. what was your best source? support your answer.