squatting.

Here in Japan I have developed a fear of public restrooms. I hold my breath waiting for the response when I ask an establishment if they have a "toilet." I Japan they believe in exercising great leg strength when using the restroom (see hole above). A Japanese-style toilet consists of this cutout into the floor and that's it. This is terrifying... someone please explain to me how this is an adequate toilet?? I am mentally taking note of all local places with a "western toilet," so I know where I can use the restroom without becoming injured in the process.