there are different styles and some bend and duck more then others. Some are just better at it and seems to come natural. Also, how much you bend or duck may depend on your opponents height as well. I seem to duck and try to get lower on guys that are taller than me to get at their body and underneath the longer arms. One thing about bending down, it can really effect your vision and what you san see coming because your eyes tend to look at the ground...so you need to make a conscience effort to keep your head up
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