Zercher squats were more of a power lift than a BB'ing one. But some BB'ers liked to include it in a leg program. Can buy a Zercher harness to make it easier to hold the bar. After awhile you will probably need some sort of padding (or double sweat shirts) if getting serious about doing that lift and you are doing set after set. The Zercher lifts can be a good one to include in a strongman routine.
You can lift the bar from the floor to the knees, in a semi-squat position, than squat down lower while putting the hock of the arms under the bar. Than raise up to a standing position (strongman style). Though most guy's take the bar off a PR, "A" frame, or set of heavy boxes. I'm sure there must be video's around showing how it's done, from the floor or otherwise.
Can work up to some pretty impressive weight in that lift. First time I saw it done, a guy was using well over 400 for reps (from a rack). He said the Zercher should be done in sets of 3's for best results. He was probably right on that (he was in the same high school class as me). With the Zercher lift, as with the DL, too many guys lift with the small of the back rather that a combined effort with the legs. So I assume there can be some unneeded injury's if not doing the exercise correctly or trying to use too much weight, too soon, before really learning how to do it the right way. Don't want you right nut bouncing off the floor, do we?
Would be a great movement to add to a MMA-UFC training program. As well as football training, though I have never seen many player include it.
Thanks to Donny, I think I'm going to try that lift next workout and see what happens. Good luck.