Height and weight may make some difference when you first start training. But as you learn more and gain more experience, it will make less of a difference. I'm lucky because there is a really huge guy in my class, and there's also a very skilled small guy. The big guy must be atleast 6'4" and almost 300 pounds. The small guy might be around 5'5" and no more than 130 pounds. I've never managed to tap either of them and i'm 5'11" 225 pounds.
Some people will also tell you that long limbs makes the difference but that is not true. A person with long legs and arms may seem to have the guard advantage but they are also easier to armbar.
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MrPoopy
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