Straight punches: Radius versus Ulna

Straight punches: Radius versus Ulna

Any students or instructors of mine in the past knows how much of a techniques freak I can be sometimes. Not only in how something is done, but also the why. Any little bit of information about why we do techniques a certain way has always peaked my interests. Here is the quick and nerdy version for the straight punch... you've been warned!

I wanted to write quickly about the straight punch. More specifically about the radius and ulna. Sounds like a weird math formula right? The radius and ulna refer to the bones in your forearm that connect your wrist to your elbow. The radius connects to the thumb side of your wrist and is the larger of the two while the ulna connects to the pinky side and is the smaller one. An easy way to remember the difference between the two is the word radius is longer than the word ulna just like the bones themselves.

Why is this important for your straight punch? If you have ever been taught how to throw a proper straight punch you have probably heard the instructor tell you to make contact with the first two knuckles of your fist, or the bigger two (pointer finger knuckle and middle finger knuckle). Those two knuckles are better supported by the radius and that is why we make contact with them. One of the main reasons why people feel pain in their knuckles or hands after punching is from not making contact with the correct part of their fist.

I encourage students that always train with gloves on to take them off, tone down the power, and see where you are making contact on your hand. In Krav Maga self defense we are mostly bare handed. It is hard to tell sometimes what part of your hand makes contact when you have a glove on. I hope you found some of this information useful.

Let me know whats on your mind! These are conversations I've had over the years with students of mine as well as high level instructors. Have a great day and go train some Krav Maga. KIDA!!

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