Weight lifting and change up your diet if you want mass gains, if you want to improve your boxing skills just workout more on the bag/boxing gym. There isn't anything that can make you stronger(legally) it's all mental; keep working hard and stay dedicated to the sport. You can do it!
being thin is a good thing, you dont want to be big because then you will weigh a lot and have to fight naturally bigger dudes.... keep your weight down and you will be up against small dudes that are similar to you
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