Free calligraphy model book download from 9610: http://www.9610.com/qinhan/scb.htm (This is an excellent version of 史晨碑 rubbings collected by a Japanese museum. Over 60 pages of the complete model in HQ resolutions.)
Sample characters (not a phrase) in this video are not from 史晨碑 - they are a "blended" style: 奉 attend to; (more meanings in the video slides) 詔 imperial edict 史 history
Most Li Shu masterpieces we use to practice copying were carved onto stone tablets or steles. We call Chinese calligraphy on the steles the Stele School ( 碑學 ). When practicing calligraphy of the Stele School, we may vibrate the brush very lightly to mimic the carving effects of the strokes and to give them blood, bone, liveliness, depth, and various nuances. When practicing the calligraphy of the Stele School, the writing speeds need to be slower - usually the slower the better - but not stagnation.