It's a 2-for-1!!

From Gizmodo:

It's like a single replacement for a chair, and coffee.

Absolutely unnecessary comma there, then, in the very next sentence, a bit of misspelling.

I find that physiologically it also makes a great alternative to the sitting position, where one's back and gluts and neck are constantly stretched while the hip flexors and abs are constantly compressed but unused.

This is unfortunate, because 'glut' is actually a noun and fits perfectly into the sentence from a grammar perspective. It's just not the word he meant to use.

Source: http://gizmodo.com/5210799/samurai-ergonomics