I'm having trouble doing this trick. This is where you run along the grid line to run past the cubes to avoid getting squashed. When I try to center myself, I still get squashed regardless. Is there something I am missing? Thanks!

The only time you can do this is when there is no cube behind the one you're trying to run behind. So if the cubes are diagonal to each other, you can run behind the front one from in front of the rear one.