Stretchy bind off

Taken from Lots of Yarn:

#1 K2tbl Bind Off with a stitch between:
Very stretchy, with the look of a chain stitch on the side it’s knit.

Knit 1, *Knit 1, insert tip of left hand needle from back to front through the front loops of both stitches on the right needle so as to knit them together through the back loops. Repeat from * to *.