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Summary: Care is needed when practicing using a leg sweep to defend against a side kick, because it can injure an Uke's knee. Learn how to use a leg sweep to defend against a side kick in this free Aikido video featuring a 4th degree black belt.
"Okay. This next kick defense, I really like it. But you have to be very careful with this. Your rukia needs to know how to fall before you even get into this technique. We're going to do this slow, which makes it a little awkward. So just bear with me. As he comes in with a side kick, catch it, just like we did the front snap kick. And I'm going to hold him up here, because in reality, that's what I'm going to do. As I come in, I'm going to actually sweep this leg out from underneath him. Now when I do that, in reality, I use my hips and that can dislocate or hyper-extend the knee. So your rukia has to be well-aware of that, and you have to walk through this very, very slowly. What's going to happen is he's going to jump up and help me take him to the ground, so he doesn't hurt his knee. It's just not worth it to hurt your partner. He's going to basically jump up and land on his arms. One more time. We'll do this a little smoother and a little faster. On the other side, one, two. A little smoother this time. And now, some speed."
eHow Article: Leg Sweep against a Side Kick: Intermediate Aikido Techniques