3 ab exercises not to do?

I worked my abs really hard this week...whooo-hoo, they are sore. It started with a 4-minute max plank to pre-fatigue my six-pack. That's a new record for me. Next up was a killer ab superset of TRX standing fallouts and Power Wheel rollouts. Four rounds of 15 reps per move left my abs rocked and rolled. No crunches or situps needed, because they are a waste of time. NOTE: Do NOT do