the.com/strengthening
The act of making something harder to break, one strain at a time.
means The process of becoming or making something stronger, more durable, or more resilient.
from From Old English strang (strong), with the muscular Germanic -th of strength bolted on — the same root behind taut, strict, and string, all things pulled tight.
Muscle truthStrength grows during rest, not during the lift.
Metal trickHammering metal cold makes it harder, called work hardening.
Grammar muscleIt is a noun pretending to still be a verb.