why are they hypertrophed ?

@Aria Vazifeh 2 things to take into consideration: 1/ your own personal assessment: '"my arms are a little bit hypertrophed, more that what I need" > is this a correct assessment? How do you know? Hw do you know your arms are "too big" for fight sports? How do you know if your punch power and endurance is truly affected by the supposed excess of muscle on your arms? Very important questions to reflect on 2/ The body will always adapt to its most efficient form for the kind of activty you're doing. If you do fight training, it will adapt to its most efficient form for fighting. If you lift weights a lot, it will adapt to its most efficient form to lift weights. If you swim a lot, it will adapt to... you get the point. So if you think you arms are too big for fighting, then stop lifting weights. If you're not lifting weights, then your arm are most likely NOT too big and you're just imagining things.

i think it would help if you were a bit more specific about your goals.

I can do this.