This is the 11282nd most frequent Polish word.
hartować
To harden or temper.
The word 'hartować' is used here in its literal sense, referring to the process of hardening metal through heat treatment.
Stal hartuje się w wysokiej temperaturze.
Steel is hardened at high temperatures.
In this sentence, 'hartować' is used metaphorically to describe the process of improving one's physical and mental resilience through regular activity.
Codzienne bieganie hartuje ciało i umysł.
Daily running strengthens the body and mind.
Here, 'hartowanie' refers to the process of tempering or moderating the temperature or properties of water, showcasing the word's broader applicability.