As you can see, in the first image, the shoulders are pushed back more, as opposed to the second image, where the shoulders are almost aligned with the head. Which one is the "correct" way to do a pushup? I've seen both done before. Personally, I have always been doing the pushup as shown in the second image, which has been extremely easy for me. Doing the pushup shown in the first picture, however, is an entirely different story. Thoughts?