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I just started learning Jujitsu (Japanese not Brazilian) and the techniques for falling are different than judo and more similar to Aikido.

When i learned to do a front or side fall thru my previous martial arts experience, I learned the Judo style where you keep one leg straight and one bent. But in jujitsu, I'm told its better to tuck in one leg and keep the other bent.

Does anyone know/ can explain why the differences and what is better? I know each school has different thoughts on it, I hope experienced practitioners from each school (or both!) can share their insights. Thank you! :)

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    Do you have examples you can show for the different falls? I have years of experience in judo, but I am not sure what you mean by falls with one leg straight and the other bent. – mattm Feb 20 '16 at 2:23
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    @mattm In judo, bottom leg generally stays mostly extended and top leg is bent 90° at the knee. In aikido and many Japanese jiujitsu ryu, the top leg remains the same but the bottom leg often bends >90° at the knee. – Dave Liepmann Feb 20 '16 at 6:03
  • My gut feeling is that some of the differences might stem from the practice of Judo as a sport versus self defense. The inherent rules of competition tend to influence technique whether you want them to or not. – Sean Duggan Feb 20 '16 at 11:54
  • @DaveLiepmann In judo parlance, are we talking about rolling breakfalls (zempo kaiten) or side falls? – mattm Feb 20 '16 at 13:10
  • Dave answered my question, thank you very much for the comments! – Erick 3E Feb 21 '16 at 9:16
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I've learned both methods in judo, BJJ, and karate.

Tucking the bottom leg makes for smoother rolls and stand-ups after the fall, but makes little sense if one cannot roll and is just trying to best take the impact. It is also suboptimal for rolling if one's opponent is still latched on.

Keeping the bottom leg mostly straight is good for stopping the roll and distributing the impact, but definitely suboptimal for rolling to stand up. It is closer to the hip-switch movement necessary to roll with one's opponent still latched on.

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    Agreed. To clarify what Dave Says about not being able to roll there are some throws in judo/jujitsu that prevent this. On the other hand other throws, a push or a wrist-lock will usually allow you to roll. I also know a third type of breakfall where you arch the back and land with the feet first. This is for particularly nasty wrist-locks that hold you up by your wrist as you fall (ie you are thrown by the wrist). – Huw Evans Feb 20 '16 at 10:19
  • Do you know if the tuck your leg was originally developed for rolling on hard(er) tatami mats? – Sardathrion Feb 20 '16 at 19:18
  • It's for rolling on no mats at all. Sardathrion. I usually do that one on a wooden floor. It's not fun though, you get a line of bruises along from one shoulder to the opposite hip. – Huw Evans Feb 20 '16 at 22:02
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    All these breakfalls were originally developed on hard tatami or no tatami at all. I believe both forms were practiced in koryu arts. – Dave Liepmann Feb 21 '16 at 19:03
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    To make one point clear: In traditional, japanese Judo (as traditioned through Kata), the falls for stand-ups are with both legs (slightly) bend, almost parallely. It works just fine, but you have you back towards your opponent (see the video of @mattm). You can bend them more, like done in e.g. modern Parcours. A speculation of me always was that tucking the buttom leg and standing up over the knee would be slightly more dangerous for the knee, but keeps you more mobile while standing up: You can switch directions easily while standing up and face the opponent you're coming from. – Philip Klöcking Feb 23 '16 at 9:43
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For a judo perspective on falling technique (ukemi), the best place to start is the formal throwing techniques (nage-no-kata), where the most emphasis is placed on falling details.

For forward rolling falls (zempo kaiten), there are two basic possibilities:

  1. You cannot roll and stand up, as in the nage-no-kata fall for tsurikomi goshi. You may be restricted by the the direction of the throw, your partner holding on to you, or maybe you just don't feel like you have sufficient momentum to come up.
  2. You can roll and stand up, as in the nage-no-kata fall for tomoe nage.

When falling, you apply the same training to both situations; even when coming to your feet, you transition through the breakfall position first.

Both legs should be bent in the breakfall position. When the bottom leg is straight, there is more danger of straining/spraining the knee joint, which I have personally done before.

By tucking in jujitsu/aikido, I assume you mean something like this. This is discouraged in judo because it results in the legs crossing. When the legs cross and you cannot roll to stand up, you have the danger of your legs striking each other. This may not be an issue if throws primarily project you outwards and you can roll to your feet. In judo, you often cannot roll out of falls.

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