I understood! I understood why the archery is such a harsh people.
We take an onion weighing 15 kg (as I was explained, it is still quite weak)
We go to training and do 100 shots (also quite an ordinary training)
As a result, a load of one and a half tons is moved for training :) Without stressing!
At the same time, training in 150-200 shots from 20 kg of bow is not uncommon, easy and unforced, smooth... otherwise accuracy crumbles.
The fucking hobby!