Here's what I read on the subject. Not my words, so don't blame me if it's not true!
"A protyazhka is a snatch without any knee dip whatsoever. Smolov plugs it in a time tested combo: a snatch grip long pull x 3-5 reps + a wide grip press behind the neck x 3-5 reps + a squat with the bar on the shoulders x 3-5 reps. I believe that you would do even better if you ditch back squats in favor of overhead squats. The latter are great for developing SQ specific flexibility and enforcing a good technique the hard way. Smolov's warm-up calls for four to five sets of the above combo."
Source: http://www.sherdog.net/forums/f13/dy...-crew-1135423/