A little less than half the weight of an average person comes from their muscles, and you might justifiably ask: what do these power-house helpers do for me? Muscles serve to create both our voluntary (walking) and our involuntary (heart beating) actions, and they all move in one specific way- they contract. According to the website Top 10 Facts About the Muscular System:
"Muscles cannot push. They can only pull. When something in the body is 'pushing', its actually because another muscle is pulling. For example, when you push something with your arms, it is actually the muscles in the back of your arm pulling your elbow."
So when tracking how you move, and what areas are working to create that movement remember- do be pushy! Think about pulling.