At the CrossFit gym I was going to we had a girl make the mistake of asking that and was led through the coach's CrossFit ab workout. She did things like:
Balancing on her hands with her ankles in low hanging rings, then pulling her knees up to one elbow, swinging out and around the side, and then the other elbow, back and forth.
Knees to elbows. Hanging in pull up position, puller her knees up to touch her elbows. Or toes to bar, which is the same thing only worse.
"Russian:" Balanced on her sit bones with her feet at least a foot off the ground (sometimes called boat position, balanced on her butt) she held a weighted medicine ball and twisted to touch the ball to the ground on either side of her, back and forth.
Balanced in plank pose for 2 minutes with a weight on her back.
I don't think she ever asked for an ab workout again. Good luck.
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