You don't even need to be an expert to see that peeling a hand off your shoulder like that is questionable. Even if you had an exceedingly strong arm, you'll still need your attacker's co-operation for that to work. The whole point of self-defense training is knowing how to extract as much power as possible from your *entire* body.
The best thing a woman can do when facing a dangerous male perpetrator is to run. If cant run then find anything that can be used as a weapon. If no weapons available then scratch, bite, gouge, kick, scream, fight as dirty as you can. But more then likely you are still going to be overpowered if he is determined. Simple truth is, your average male is at a significantly more advantage then your average female.
This is my favorite (and IMO definitive) video on the subject of bullshit women’s self defense tactics.
[Quit lying to women about how to survive violent attacks. ...Please.](https://youtu.be/i54grFI-JhA
Teach your daughters jiu jitsu
The best self defense move will always be: Turn, scream and run.