When you are finished your workout and are waiting for somebody else to finish hers so that you can drive her and yourself home, do not load up the bar to a +5 kg PR in the front squat and try to do an unspotted negative repetition with it after reading somebody's article on the internet, thinking you can bail out of it easily in the deep squat position. That's about all I can think of to offer.
I'll counsel lifters to distribute their abdominal work throughout their workouts, some as warmup, some in between warmup sets for the exercises of the day, and some at the end.