Good idea. I don't know whether it's "too basic" to put on the site, but I shouldn't think so. One of the things you tend to forget about because it's so natural.

If your getting back pains, try sitting straight if your not, leaning forward always strains my back.

I've tried sitting in the classical position while playing guitar, it doesn't really do me any good as it's only good for precise music like classical, if your playing lots of different genres then you usually need to get into the groove.

Besides which I like the fretboard horizontal to me when im playing, not diagonal like in classical, makes it easily to hit the higher frets too.

You'd have to speak to an instructor about adding it to the site, dunno where they would put it though.

- J