Bull Ring from little league thru 8th. It disappeared after that. We did not call it "oklahoma" drill but did it all years. One year we did it under a cage so as to "teach" you to not go high. As some have mentioned we also did a drill called "bloody board" which was a 1v1 drill where both players, each at the end of the 10ft 2x4, were to get up, run and smash the other person. I felt sorry for the slower guys as coaches weren't keen on physics back then. Monkey drills on training days were fun. "Down Ups" were never called burpees or navy drills. Gassers (horses during basketball season) were fun. The one drill I hated, on mat drill day, was one where you put your hands behind your back and belly-flopped on the mat. Coaches didn't want to see you slide, sadistic fks.
All that said one of the tougher(ok maybe embarassing) challenge, was your birthday or the last day of 2-days for the fish. Regarding your birthday that was the day you either purposely did not show up or you chose violence. It was some long-held team tradition to get wrestled down by the linemen and get spanked with wet-weight belts. In later years, I hear the glee generation added the strip them down part.
There was always also a long-standing tradition that the last day of 2-day varsity practice ended early and the one for the fish went long due to extra gassers. The coaches turned a blind eye to whatever the varsity had planned for the freshman. That year the entire fish team leapfrogged the length of the field solely in their jock straps and bear crawled the entire way back. Did i mention that the dance team and cheerleaders were invited to watch? They got it easy.