you must give me more info about yourself than that. i am about 5'9", and i fight at 141 lbs up to 152 lbs (more at 141 though). But when I'm not in training, I weigh anywhere from 155 to 165 lbs. So height isn't in any way, a sign for what weight class he or she should fight. Usually either a GOOD manager (in caps b/c all of them say that they are great, but you must find the right one), and the doc decide this. Many times the fighter feels it out himself also. They look at your strengths, body shape, your metabolism, plus many more factors and capitalize on them. So choosing a weight class is more strategic than it seems.
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