Lynne
Master of Arts
We haven't actually practiced an uppercut to the underarm as a technique unto itself. The uppercut is the second move in one of our forms, Pyung Ahn E Dan.Where are your legs/hips situated at the moment the strike is launched?
I don't see myself throwing an uppercut to the armpit when the solar plexus and jaw are right there.....HOWEVER.......If my left arm has hold of his right arm/wrist( like maybe i just blocked/caught a punch) and my right arm is to throw the "uppercut", if you check your hips into them and instead let the "uppercut"become a scoop where his right arm is held onto by your left hand near the wrist, and his upper arm in the crook of your "uppercut", you're three-quarters the way into an ippon seoinage as in Judo/Jujutsu ( one arm shoulder throw).
The first move in the form is a combination; one arm is blocking one's head and the other arm is extending into a hammerstrike. Since blocks are really strikes in TSD, you are hitting the opponent with both fists. Even the fist blocking and protecting the head strikes out and hits the top of the opponent's head or forehead because you punch as you are doing it. The hammerstrike is to hit the nose. The person will involuntarily lean over. In most cases, you'd probably uppercut to the underchin area. But you can uppercut to the underarm area. Probably the last thing I'd think of.
(If anyone wants to make clarifications about Pyung Ahn E Dan, please feel free to do so. Some schools also use a yup makee instead of the hammerstrike.)
However, I can see how the underarm uppercut could be used in some combinations. Say, we grab a person's wrist with one of our hands on top and the other underneath, and spin underneath their arm, and end up either in front of them or off to the side. If their arm is drawn up in a "chicken wing" fashion, we usually uppercut or reverse punch to the kidneys/side of ribs. At that point, you could definitely uppercut to the underarm area.
In Judo, I know that you typically use the person's momentum against them. (I remember one basic throw with the person coming behind you - I'll never forget how to reach behind, grab the shoulder, squat down a little and lean over while pulling. I remember the judo roll,too - where you lay on your back, put your feet on the abs or hips and throw the person behind you. I've always suspected they'd actually land on top of me though if it were a real attack...and if they weighed a lot.) I suppose if someone were attacking you from behind, you could drop down while holding onto their arm and then strike upward into the armpit. In a self-defense situation though, it seems more likely to hammer the groin then do a headbutt when they lean over or pull them over. If they were coming toward you, I imagine you could grab the arm, lift it and do a uppercut to the underarm. That would be something. Their momentum against your fist. But if your fist wasn't formed 100% properly, I think you'd wind up with a broken wrist. Maybe you would both pass out, lol.