This is the 17755th most frequent Russian word.
укрепительная
"Fortifying" or "strengthening."
The word 'укрепительные' here describes measures intended to make something (the house in this case) stronger or more secure.
Мы приняли укрепительные меры для защиты дома.
We took strengthening measures to protect the house.
The word 'укрепительная' here modifies 'гимнастика', indicating exercises focused on strengthening the body.
Укрепительная гимнастика помогает улучшить здоровье.
Strengthening gymnastics help improve health.
The word 'укрепительные' here is used to describe toothpaste that strengthens teeth.