What are all the pros and cons of having weigh-ins on fight day? They say many match-ups could never take place if they kept fights the same day as weigh-ins. True, but often someone gaining 12-20lbs back with-in a day or so seems more dangerous and often less competitive. A fighter at his natural in shape weight is going to be at his best. Take Marvin Hagler for example as he average 159.5lbs. His heaviest ever was 163 (once) and his lightest was 155 (once). He had his first pro debut at age 18 and his last bout against Leonard he was 32. After a certain age (around 30) it is natural for fighters to go up in weight simply for the fact that your metabolism slows down and you can only burn so many calories and keep your strength so you end up adding muscle.
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