Box squats, sumo deadlifts, board presses, rack lockouts, thickbar training, calf raises with a barbell on traps, sled dragging (outside, of course and the gym owner promply forbade it) ummmmm, pushing my Bronco (outside again!) lunge walks across the parking lot, towel chins, turkish getups, natural glute/ham raise, squatting on a swissball (no weight though and just because I can!) you name it, my old gym never heard of it!
In fact, my favorite story is that sled. The resident (degreed, by the way) sports trainer had no clue why we would drag a weighted sled. The owner consulted with him before she forbabde its use! He threw me under the bus by shrugging his shoulders when asked about it. I was NEVER consulted, however! Forget the kegs I used to secretly lift behind the gym. I came outside one morning and saw the manager and the owners husband trying to C&P my keg and laughing their asses off the entire time. Needless to say THAT was never banned.