Hi. This can give you and idea of how to approach blocking a straight punch.
I also apologize for the poor audio quality but hopefully the CC helps.
This technique shows a double hand block. Mark Mitman and I are working with our students/friends Igor and Kwok. We demonstrate how to control the arm and where proper placement of your hands should be, how to strike and move your opponents center of gravity, where your footwork should be, how to ground your opponent so that he/she can be easily driven down. Also note at 2:24 my body posture as I ground Igor. There is no bending at the waist.
So this gives you an idea of the gross motor skills, shows how proper body structures should be, energy flows. But like all videos, it can't show you the subtle nuances and give you feeling of how things should work.