To be honest I have never used elbows standing in front of my opponent, i have been held around the waist with the person behind me and elbowed the hell out of them.
I generally try and stay away from the clinch and fight on the outside because of my long reach (79.5inches) but in the clinch I tend to hug my opponent and put my left leg beside their right leg and twist and fall with them and gain top position, that or I rock left and right voilently and throw hooks like their going out of style.
But I imagine if your good at throwing them and you can land them, it would be a very affective strike.
If a law is unjust, a man is not only right to disobey it, he is obligated to do so. ~ Thomas Jefferson
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