Yare yare. Eugeo shook his head as he carried out a large barrel that
was filled with straw, just as Kirito did. Both of them looked rather
relaxed, but the weight of this 1-mel diameter sturdy wooden barrel
would be pretty shocking even if it was only filled with straw. An
ordinary young man of similar age could probably only take a
maximum of 20 steps while carrying this barrel.

As for why the two skinny looking boys were not even sweating, the
reason was that their «Object Control Authority» was ridiculously high.
They could both wield the longsword that was lying against the wall of
the warehouse— the Class 45 «Divine Instrument» level object, almost
at will.

(Alicization Running, 151)