Groin strike experiment for a YouTube self defense video(information in description)

The first half of this is irrelevant to what we're actually testing. I saw a move in a YouTube fitness video and wondered if it could be made into a useful strike, it definitely can't 😂. So when we were done messing around we got to the strike we're actually testing which is a popular tactic I see in self-defense videos on here, flutter kicks to a grounded opponent's groin as you get back on your feet. This looks effective in demonstration videos and sounds effective in theory, but as you can see from our test it isn't. Out of a dozen shots she only nailed me 3 times, and even then it didn't hurt enough to roll me on my stomach (as usually happens from a devastating hit). Now I'm no self-defense coach so maybe we missed something that would've made this hurt, but based on my experience, I'm saying this tactic is garbage. As a former martial artist and brawler though, I just gotta put my two cents in on this. Don't fight from the ground if your enemy is also down, just get up before they do🎃.