Butterfly Crunches and Frog Sit-ups

Based on the video below, butterfly crunches and frog sit-ups appear to be the same thing. Until today, I had never even heard of frog sit-ups. I have done butterfly crunches for years; my current Calisthenics & Abs routine includes butterfly crunches. Yet the woman in this video is using the same form I use while doing butterfly crunches.

Are they the same exercise with different names? Or am I doing butterfly crunches incorrectly?


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