I purl conti like Amy does in the video, but I've seen people purl by holding the yarn (still in left hand) between their thumb and forefinger and wrap the yarn around the needle. Hildie does that and purls faster than anyone I've ever seen! Some people also do the knit stitch that way.
If you're knitting stockinette, you can always knit backwards--I taught myself to do that because I purl slowly and because my purl tension is much looser than my knit tension. Just google 'knit backwards' or 'backwards knitting' and you'll get all sorts of hits for sites that explain how it's done.