I am reposting this fascinating article on the Bulgarian system. Coach Ivan Rojas originally posted this on www.ristosports.com/blog, our sister blog. He writes about Medvedyev's work and draws a short conclusion at the end of this post. I added verbage in blue:
Lucky for us, Medvedyev's unlocks the secret to the incredible Chinese success...
Finally, Bulgarians do lots and lots of reps. This is contrary to most of the rumors you will read on internet forums.