It happens so often now because people realized how much of an advantage it is to become really good at cutting weight.
Years ago people trained to make weight. Nobody wants to make weight now. They want to be far bigger than the weight, cut weight, pile it all back on immediately.
Think of Brook/Spence and how often those two talked about how big they are. Because they are 175-180 between fights. They are 147 for 20 minutes 30 hours before they fight.
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