well i just started friday, my instructor wants me to do it atleast every other day. it's hard to describe on the net...
he has me do a bridging drill.
-laying on my back, i cross my arms on my chest so they aren't in contact with the ground.
-i put my feet near my butt and bridge up so all that's on the ground is my feet and the back of my head.
-i then roll so i end up facing down, pyramid' with balls of feet and forehead beign the only things in contact with the ground (due to my weak neck i use my shoudlers/forarms to help me a bit on the rotation and pyramid setup)
-then i do a sort of front roll, pushing off with my feet so i end up in the first position, gotta make sure my neck is bridged though, noth resting on my upperback/shoulders
as i mentioned it's hard to describe with words, hopefully someone can come up with a vid or pics to help you