Men and women of the Russian skis team do speed work up a hill and along the flats: V2, V1, V2 alternate, Doublepush, Marathon Skate, Skate with no poles - every technique, FAST. I'm especially amazed to see marathon skate - you rarely see skiers in the US training on it.
From the video:
Speed interval training for sprinters of the Russian national team cross-country skiing, Ramsau, August 2010. Filmed and edited by Maya Huseynova for skirun.ru.
Skiers: Nikita Kryukov, Alexey Petukhov, Alexander Panzhinsky, Michael Devyatyarov Jr., Anton Gafarov, Natalia Korosteleva, etc. Coaches: Yuri Kaminsky and Michael Devyatyarov Senior.