That's because he only knows how to hit with the first knuckes of his hand. If you watch closely you will see that one of his circular punches landed on the front of the skull. If thew the punch the way that I described all of the punches would have landed on the side of the head and not the front of the head. You can also see that he missed a lot of those punches as well.
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Swinging like this will result in a weaker punch and an easier punch to see.
Had he used the swinging method that I've been champion then this would have been a knock out. This shows what I stated earlier (above). He turns his head and exposes the back of his head. Using the technique I've been telling you would have easily resulted in a KO and maybe death? Because now the punch is landing on the back of the head.
But because he uses this "thumbs down" technique. The punch doesn't land solid. @ 3:08. It was a weak punch.
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Here we see another reason this punch is weak. Elbow is leading the punch. This is extremely telegraphed and this time Hall ducks under it. If this was a circular punch like I've been promoting then it would be possible to still land the punch even if he ducked.
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This is what happens when my sparring partners try to duck. Take note that my arm doesn't have that unnatural bend. I'm hitting with the same knuckles you keep scraping up lol.
She ducks under a hook punch. Because that's what she had for lunch the 6 or 7 previous punches. Normally if I was throwing a hook it would have landed right about here. But because of how I throw my circular punches. My horizontal punches start the same way that my vertical punches start.
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I because of punching with thumb up, It doesn't take much to turn my horizontal punch into a vertical punch and landing it on the weaker parts of the the head.
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I know you keep trying to find some truth in MMA with this punch, but I'm telling you there are a lot of draw backs to trying to do this type of punch with thumb down. Don't let the fact that my sparring partner is female devalue the lesson or skill. She used to fight competitively and she knew how to throw a punch some of which I ate and my knees buckled.
If I were you I would ignore anything that demonstrates doing this punch with thumbs down. If you still want to punch with thumb down simply because you see in MMA then just be prepared to deal with the injuries that you'll get from punching like that.
Change the length of the punch to fit the space. Circular punches can be small in length or long in length. I train in small spaces just to explore the limits of this type of punch. The smallest area that I've been able swing this punch is a 3'5" x 3'5" area. I'm 5'9" so If I can do this punch in an area that small then you should be able to do it there. But again that's thumbs up and not thumbs down.