"I have decided to move back to light flyweight because that is my original weight category. I feel the most comfortable competing in it and I don't have to punish my body to maintain this weight," Mary Kom, an Olympic bronze-medallist, told PTI.
"I am feeling very positive once again and just wait and watch what I do now," she added.
The award comes as a bright spot in a rather disappointing year during which the multiple-time Asian champion missed out on qualifying for the Rio Games after losing early in the World Championships in May.
There was speculation that she could even call time on her career after she accepted the Rajya Sabha nomination from the government. But the effervescent boxer is raring to come back to the ring now.
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AIBA President Ching Kuo Wu has already stated that he considers it his responsibility to ensure that women's boxing categories increase from the current three -- 51kg, 60kg and 75 kg -- to five by the 2020 Games.
Mary Kom's trainer Chhote Lal Yadav, who is now an assistant coach with the national women's team, said the diminutive Manipuri has been training with rigour.
"The power in her punches has increased manifold because of this decision as she no longer has to work hard to increase her weight. Light flyweight is her natural weight and that has improved her strength. She has been training hard and will be a force to reckon with," Yadav, who is here as Services Sports Control Board (SSCB) coach in the ongoing men's National Championships, said.
It is notable that Mary Kom's last world title, in the 2010 Barbados edition, had come in the 48kg category, while four others had been achieved in pinweight (46kg) prior to that.
She had jumped to flyweight 51kg after it was included in the 2012 Olympic Games. She went on to win the bronze medal in the Games. She also won a gold medal in the 2014 Asian Games where women's boxing made its debut.