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Accidents, Aikido, Alignment, asia, Brutality, Budo, Economy, Ego, Endo sensei, Fear, Feelings, Happiness, Healing, health, Injuries, Integrity, japan, Kindness, Martial Arts, Mind, Seishiro Endo sensei
“A torturous lesson in physical terms
The only way some people learn
Stretching the body in every direction
Forcing the joints unnatural flexion”
Alexander Webster
Lately I have been writing more about the philosophical aspects of aikido in this blog. I prefer to not speak so much these types of things on the tatami, because our time there is precious, because it is the NOW. This is a better format to put things into perspective, and connect what we do to the rest of the world.
This time though, I am going to put my finger on some very physical and tangible themes: Various types of injuries in aikido, and strategies on how to avoid them.
We can basically divide them into two types of injuries. Accidents on one side, and long term effects on the other side. In both cases they are mostly consequences of mistakes. There is an element of random chance involved, as with all things, but if we are acting correctly, the probability for the damage is much lower than if we are careless.

I would first say that we should work on things based on two things:
- Frequency/probability of that event occurring in our practice
- The amount of expected damage in case it occurs
Getting a meteorite in the head would definitely max out the damage potential, but it is not very likely to happen, so it is not on our lists. On the opposite side, we will get minor scratches from your partner’s finger nails, some blue marks from some partners as they grab. It will happen, often, but it is a minor injury easily solved with tape, and we will practise the next hour.
Even though I have shed blood, and have a scar on the inside of my right wrist, from getting caught by someone’s wedding band on kote gaeshi (as the finger clenches the gap between metal and hand is biting), I count it as a not frequent injury (it happened to me only 3 times in more than 20 000 hours, various situations), and not serious. As soon as I was taped up, and blood was wiped up, I continued to practise. And yes, the fix is very easy for this one, so let’s study some more tricky ones, with higher frequency/probability, and greater damage potential.
We can also divide the injuries into different categories depending on who the victim is: Beginners and advanced practitioners have slightly different injury stats. People who practise every day and people who only practice a few hour per month also differ quite a lot. And there is the most frequently injured group who regularly almost don’t practise aikido, but then, during a seminar or for preparing for an examination does a short period of far more practice than regularly. These guys get hurt a lot!
Beginners very often have injuries to the shoulders, neck, collarbones, sometimes the head, from learning ukemi. These are mostly caused by too much stress on learning things quickly, not having enough attention from the teachers. AND when it happens, it is repeated! The same accident happens again and again, making it chronic. Fear reactions trigger the injury to happen again and again, and it becomes a circle. Patience, doing things step by step, enjoying the basic exercises and using diverse ways to build up the ukemi is a solution. But often it is down prioritized. Unfortunately many beginners never get past this, and they leave the aikido society before they find the solution, always associating aikido with the injuries they suffered before they stopped.

Also, different training societies have different statistics. People doing hard joint locks on each other, well, guess what, most people wear wrist protection when going to class. This one is also an easy fix. Just be kind to each other, and base the aikido on aikido, and not jiu jitsu techniques in the guise of aikido? But yes, this is probably a big one in the aikido world. However, not so big in the part of the aikido world I am most frequently in contact with.
Alignment of our body parts is a huge part of what we do. I would say that the principle integrity is a fundamental principle defining aikido, together with kindness and economy. Being fully aligned will make us able to receive a huge amount of pressure from our partner without receiving damage on our body.
I will try to stick to the general case, and it might not be the exact distribution of probability for just YOU. However, I guess most of these injury types are classical ones, which happens enough to be worthy of our attention.
Long term injuries
I guess the accidents are the most interesting situation, but let’s look at the long term wear injuries first. Hips are a frequent one, but I guess number one on this list is knees.
I would guess that alignment and not smashing the joints is an important factor, not counting the genetic factors. Some people are just simply more robust and can take a bit more before a problem arise.
We are practising on different types of tatami and floor. When it comes to smashing the joints, the properties of the tatami and floor is relevant for taking away the energy from the fall safely. Sometimes the floor beneath the tatami is a bigger factor than the tatami itself. We are talking long term. Tens of thousands of falls. In some dojos the tatami is lying directly on concrete. Even though the tatami helps us survive each fall, the concrete is not giving.
Then there is the other problematic tatami, the friction properties. Not enough friction is also an issue sometimes, where we slide and have accidents from slipping. However, high friction is far more common. This brings us to the alignment part.

Aligning the body is both an in the moment value and a longevity value. When we turn our body, as we do a lot in aikido, it is very important that the feet and knees are aligned during the turn. If the foot is stuck on the ground as we turn we are grinding the knee. This is not something we might notice the first 15 years, but the knee is not designed for turning. The knee is only supposed to extend and bend, never rotating. This is why spikes in the football shoes is causing every football player to have broken knees before they turn 35. This could also happen to us, if we let our feet stick to the ground like if we have spikes under our feet. If we have tatami with friction below our feet we should be super attentive about how we move our legs.
The tatami type with high friction is very often much cheaper than the smoother ones. They also have less potential for removing the big impact from hard falls. When our ukemi is fully developed, we can take care of that also, but I would say that good floor and good tatami is always on top of the wishlist for a dojo.
So let’s talk about the wear from smashing parts into the tatami during ukemi. We will do what we do. If we never practise something different, we will just keep doing what we are used to. There are many, many ways to do the falls in aikido. I would say that nothing is absolute correct and absolute wrong. However, some combinations of things makes problems for our body over longer periods of time. Now there are many ways to change this. My way is to always touch the tatami as if I were a cat: paws down, and gently. This requires practise. I find that it is worth it. A lot of people ask me about these things, but basically, once you understand a few basic points, what you need to do is practise, and no recipe I can write down will change it, unless we practise doing the falls softly, every time, every day.
There is also the opposite solution. Not falling at all. This takes away a huge part of the fun and a huge part of our investment in the art though. I would say that unless we are handicapped, or of an advanced age, it is better to find a way to do it than to abstain from this part of the practise. In our group we have several practitioners in their high seventies, approaching 80 year, and still doing some high falls. They are my idols, and I hope to be able to do it as well as them when I get their age.
Accidents
Now let’s look at the accidents. These are more easy to classify, because we know immediately that it happened, and what caused it. It usually has more than one cause. It is a bit like the rules of fire arms. We can break one rule and sometimes two and still survive. But if you break three rules you die. The reason it is built like this is that you should be able to live with these rules. We do make mistakes. If we make the mistake of assuming that the weapon is not loaded, and at the same time make the second mistake of having our finger inside the trigger guard, there is a chance that we will have an accidental discharge. However if we followed a third rule and kept the weapon in a safe direction, nobody will die even if we made two mistakes. I guess we should have the same logic in aikido. We should have to make more mistakes than one before an accident.

Collisions
This is probably the most common accident in the aikido society I have most contact with. Crashing with a wall or pillar could happen, but very often it is a collision between ukes. Sometimes an uke being thrown into a tori from a different group or a person waiting for their turn. This is both very common and the damage potential is high.
This is a very common and in most societies it is dealt with in a structured way. For the most part.
- We hit the same spot every time, so everyone around us knows where we throw
- We throw only parallel to each other, and to the same direction
- We throw towards an endpoint without ambiguity, wall, pillar, or huge amount of distance to the next group
- We always go forwards when taking ukemi (this one is usually where people divert from the common rules)
The last one is usually where the mistakes happen, and people are getting injured. Falling backwards is common in aikido. We even do it for the basic tests. It is in my opinion very dangerous. It is even worse if we fall backwards and in a different direction from what tori is intending. In which case we should not be surprised if we are surprised on our blind way down to the tatami.

When falling backwards we are 100% trusting tori to check that there is clear space where we go. Sometimes the situation change after the throw happens, and our neighbors on the tatami breaks one of the other rules + also sending someone backwards, there we go.
When we follow the same advice as when we are tori, and never move backwards, we avoid these problems. We can see where we go, and can adjust if something is in our way.
There is an opposition in relation to MMA when it comes to where we place the back of our head. In MMA the partner is the threat. They will look for a possibility to kick us in the back of the head when we are down. In aikido the crowd around is the threat. They might kick us in the back of the head, unknowingly, during their ukemi. I have seen it happen. I guess we should position the back of our head accordingly. It is safe if facing the wall or pillar, meaning we are looking into the room. It is also safe if the back of our head is facing the partner, so we observe the crowd around us to the sector away from our partner. In MMA it is different. We place the legs towards the partner in a guard, because they are the ones who most likely will kick us in the head.
Weapon accidents
These accidents are similar to the collision accidents in some ways, but less common maybe, but the damage potential is still intermediate so it is worth mentioning.
The alignment of the groups are important, as most of the accidents I have seen and been part of is people hitting a person in a different group. There are always the odd group thinking that it is brilliant to practice in a direction perpendicular to all other groups. This logic is more common with weapons than when throwing, but the consequences are very similar. When we keep our eyes on our partner and in our kamae have our weapon behind us (wakki kamae), we don’t know what is there.

We need to develop an awareness about the space around us. So when nothing else is moving we should be able to perform the kata without checking, and without touching the pipes, lights, or beams in the ceiling, the walls or pillars. This is a skill that is very useful also for our aikido in general, but it is fundamental when practising in a crowded room. We need to check what is behind us before we start, and then we should know what is there. If a group is going in the perpendicular they are sabotaging this part for every group they are intersecting with.
The awareness about how much space a move will take is fundamental to avoid hitting the person in the group next to us, or the person behind us.
Hakama related injuries
This is the one that I think is least discussed than any of the frequent issues. In my experience it accounts for almost a third of the serious injuries in the aikido society I am most frequently in contact with. Despite of this, it is mostly presented as a mystery why the injury happened. It was a product of bad luck. No explanation of the causality was represented.
I remember when I started using a hakama I saw that these injuries happened, some less serious, some somewhat serious. I actually stopped wearing the hakama until I found out how it happens, and how to avoid it. However, this was a product of my own study. No teacher has ever taught me about these parts.
The accidents happens in slightly different ways, but in every single case I have seen or experienced it was the front leg, not the back leg, of uke getting trapped in tori’s hakama. It can happen both during mae ukemi and high falls (tobi ukemi). The higher speed it is the more severe the consequences are.

The injuries I have observed are:
- Hyperextended hamstrings
- Broken knees
- Spinal prolapse
- Broken teeth
- Broken nose
- Broken collar bone
- Broken shoulder
- Broken toes
- Concussion
- Twisted ankle (of the tori actually!!!)
In the case of the twisted ankle, the weight difference was actually so big in between the tori and the uke that instead of hyperextending the leg of uke, which in my opinion is the most common result, tori was jerked out of position and the ankle was injured.
What causes this injury to happen: The space immediately behind the front heel of uke, around 10 – 15 centimeters, tori should not have their legs. The hakama extends forward and out to the sides some centimeters, and if we put up our hakama it can extend more. We need to know where our hakama is. If we are leaving this to chance, an accident WILL happen eventually. The front leg of uke is usually far away if we perform the kata correctly.
Katas where this injury frequently happens:
- Kote gaeshi
- Kaiten nage
- Kokyu nage (including ikkyo, nikyo, sankyo -nage)
- Juji garami
- Other katas with big mistakes involved
The ones I mentioned are where only smaller mistakes is enough for this to happen. When we are tori NEED to KNOW where we place our legs. This is extremely difficult though. Most of us have no idea where the legs are, until we spend time studying that part.
Some teachers have spoken about injuries of the back leg getting caught. I have never seen this case myself. That does not mean that it could not happen, but I have never seen it. Their advice is to not kick with the back leg during ukemi. I guess that would solve such a situation. However, without kicking, if tori is standing with the hakama in the area directly behind the front leg of uke, the heel WILL catch. This is the case I am discussing here, because this is the one I have seen happen, many, many times.
Let’s list also the different situations where I saw it happen, in order of frequency
- Tori is standing in the wrong position, uke’s front leg is caught
- Tori was originally in the correct position, but jumped forward after the throw, same result as above
- Tori was doing the throw correctly, but then turned to the next uke and flipped the hakama around, away from their body, causing the poor uke to get caught
- A bystander from a different group is standing with their back turned, or even walking backwards into where the front leg of the uke will go up.
- In group practice, a partner from the same and a neighbor group is returning to the position after being thrown, and when walking by is flipping the hakama while stepping so that they catch the front leg of uke being thrown at that moment.
Basically it is an easy fix: Just don’t put your leg where it should not be.
The reality is that a minority of the aikido world knows this, so you will be in the situation where people will try to throw you in a dangerous way.
Sometimes we can fix it as uke.
- Uke moves to a different location prior to the fall, to clear the area immediately behind the front leg
- Uke uses a free hand to brush the hakama aside, and hold it in place while falling
- Uke jumping to a safe spot and taking alternate ukemi to save ourselves from a nasty injury
There are solutions, but mostly, tori is responsible. It is a little bit like getting shot by accident. It is mostly the person with the firearm being responsible for the accident.
This injury is the reason why I wrote this blog post. It is a great risk to our health, which is a bit under discussed in aikido society. I would say it is a high percentage of the injuries, and it is very serious injuries.
Tatami related injuries
This one is a small amount, but it is still there, and most of us will at some point have this injury during our aikido life.
I have already mentioned tatami with bad floor below, in combination with hardness or lack of energy absorbing qualities. And I have mentioned tatami with problem with the friction. Both too high and not enough friction can cause problems, but it is much more frequent and severe with high friction.
Now let’s look at a different aspect of tatami injuries: gaps in the tatami.
Sometimes gaps are difficult to avoid, especially during seminars. However, in our home dojo, it is beneficial to try to find a solution where the tatami fit together perfectly, and we can safely move on it without risk of getting stuck in the holes. Life is life, and it will be what it will be. So to avoid breaking toes in the tatami gaps, our first protection is our awareness.
How we move our legs is very important to keep ourselves from kicking into tatami edges or stepping into holes. Again I would take the cat as an ideal. I know that there is a large part of the aikido society who prefers to slide the feet along the tatami. However, I was taught a different way from Endo sensei, which he says he got from Kisaburo Osawa sensei. He lifts the legs more than traditionally in aikido, however more closely to how I learned from Kashima Shin Ryu.
I guess there are benefits and disadvantages with every way. However, for me, since I changed my way of moving the legs, the tatami gaps has not been bothering me, so maybe this way is better for this aspect?
Safety
For me safety is the number one priority in aikido. I always search for ways to do things with less risks for accidents, and more long term longevity for both myself and everybody around me. If we have a problem with our health preventing us from practising we will not develop. We miss the hours. If we find a way to keep practising without any risk of further damage to our injured part it is great, but it is definitely a priority to not get hurt.

My second priority is entertainment. With the same logic, if it is not enriching in our lives, if it is not fun, we will also not do it. I don’t believe in forcing ourselves to do aikido. Nobody does it, long term, because they force themselves. The people who don’t have fun will do it less, and then stop doing it. When we are not on the tatami we are not developing. So safety and enjoyment are the most fundamental parts of the practice.
Now I have spoken a lot about the negative parts of our art. Damage which happens to our body as a consequence of when we make mistakes. Mostly we are never safe from making mistakes. And just as with the firearms rules, one mistake is still relatively safe, as long as we don’t make two mistakes at the same time. We have a very low frequency of injuries and accidents in aikido, compared to almost every other activity. The funny part is that most aikidokas are injured when we have been skiing in the mountains or something. Which is consequent with the logic of people get hurt when we do activities we normally don’t do.
There are other types of injuries which I did not mention, of course. However, in my opinion the biggest contributions comes from hakama injuries and people colliding when going backwards. It seems to me the greatest potential for making the tatami more safe.
Practise safely, and enjoy your keiko! Aikido makes people happy!










































































