If you practice a martial arts style which involves joint locks, a style such as jujitsu, aikido, hapkido and so on. Strength and flexibility in your joints, and of course, active and passive range of motion training in your joints will help quite a lot for injury prevention and performance.

It is important to note that some joints cannot develop flexibility beyond the normal range of motion unless someone decides to stretch the ligaments. And this is not something that we will talk about here. But while you can increase your wrist flexibility quite a bit, your fingers and even in your shoulder joint, if somebody puts you into an arm bar, leg bar, knee bar you cannot get more extension of the elbow or extension of your knee than there is. I'm putting this out there for people to realize that with some joints is just not possible.

My own personal interest in developing strength and flexibility in the joints was specifically as a defense against locks and also as injury prevention. It all started when an overzealous beginner student who was doing a self defense move, used full force on my wrist and injured it.

At that time, the closest thing that we did to wrist conditioning, either flexibility or strength, was doing back of the hand pushups. Nothing else. While I was waiting for my wrist to heal. I was hanging out with one of my friends who was taking lessons in a gymnastics school. He was a martial artist, but he wanted to learn how to do gymnastics skills for the competition purposes. And I witnessed some of the gymnasts in his school having freakishly crazy wrist flexibility. Not just extension of the wrist, which is when you put your palm on the floor, but also the flexion of the wrist, which is when you put back of the hand on the floor. And that got me thinking.

What if I have such a crazy flexibility in my wrist, that if someone tried to do a wrist lock on me, by moving my wrist into flexion, in other words, kind of pushing my palm toward my forearm, I would be able to actually come out of that lock simply because they wouldn't expect that much flexibility. They would expect the range of motion to end and the pain to set in maybe at 90 degrees or something like that, but not at 120, 130, 140 or more degrees. I wanted to test that theory right there on the spot by asking these students if I can lock their wrist to see if they feel any pain or not and how much I can actually lock the wrist. But I was concerned that I might hurt them and it's not going to be a good thing.

Although I had a hunch that this flexibility would be extremely helpful to prevent the person doing the lock from doing it successfully. So while my right wrist was healing, I decided to start training my left wrist. The flexibility and strength exercises were primitive. Nothing like something that I know and practice now. But I knew some basic concepts. And those are the concepts that I followed. After a while I began to develop flexibility and strength in my wrist. Although I believe it could have happened a lot faster, have I known what I know now. Eventually, my right wrist healed, and I began to train my right wrist as well, even if it did lag behind.

Eventually I felt like I was ready to do an experiment on myself. I chose my left wrist because it was more flexible. I asked one of the people I was training with to try to lock my wrist and take me down. In other words, in a supinated position to turn my fingers up and my palm toward my forearm and from there to pull me down to the ground. He did, and he brought my wrist into flexed position and when he tried to pull me down, I had enough range of motion to simply slip my hand out of his grip.

Subconsciously, he was so sure that my hand is secure in his hands that he didn't even try to hold my hand. All he was doing is pushing with his thumbs into my knuckles and pulling with his fingers into my wrist. But he didn't try to squeeze and hold my hand, so I easily slipped it out.

The significance is that if someone ever tries to do this to you in a real confrontation, which is extremely unlikely, you will have an opportunity to recover your arm from the attacker without getting injured.

At the same time, what is a lot more likely is when someone is performing a joint lock on you who is not well trained, doesn't have good control, or simply is using excessive force, thinking that it's an actual self-defense situation where it's just training, you have an opportunity to escape an injury.

If I had that level of flexibility, I definitely would not have gotten injured.