skull crush's(how to do them?)

[kidda9]

Could someone please describe the correckt way to do skull crush's?I have had alook on ExRx and could not see them anyware.Any help is much apperciated!

 

[Shmoo]

http://www.theministryoffitness.com/mof/library/anims/skullc.htm

 

[kidda9]

Thanx,i know how to do them just didnt know they ware called that.Thanx again