Professional fighters get winded after a throwing full strength haymakers for a full minute can get winded and their gloves weigh barely anything. Swinging a heavy sword and hitting a target at full strength will get you tired very quickly.
Different fighters with different training/specialization, physique get tired differently.
If your profession in life is to swing a sword or throw a punch you don't tire "very quickly".
I would be a total failure as a boxer if I ended up exhausted after 1/2 round.
P.S.
BTW I was thought by my teacher to use my full strength punches for the right moment.
Throwing full strength punches continuously during a match it's dangerous not to mention that is also rarely possible.
I am derailing this thread, isn't it?!
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