Here is the "big fist" strategy:

- Hold both of your hands into a big fist.
- Hide your head behind it.
- Extend your arms toward at your opponent's face.
- Move in toward your opponent and try to use your big fist to hit on his face.
- When your opponent tries to hit your head, you use your big fist along with wedged arms to deflect your opponent's head shots.
- When your hands are close to your opponent's head, use head lock, and take him down ASAP.

Just made some video in my today's class. All comments are welcome.

1. Use "big fist" to hit on your opponent's head. The training is done for chest punch instead.