Adverb (fukushi), Suru verb
firmly; solidly; heartily
Onomatopoeic or mimetic wordsee がっしり
彼はボディビルが趣味というだけあって体がガシッとしている。Bodybuilding is his hobby so he has a very firm tight body with lots of muscle definition.
Also written がしっと、がっしと、ガッシと
Adverb (fukushi), Suru verb
firmly; solidly; heartily
Onomatopoeic or mimetic wordsee がっしり
Also written がしっと、がっしと、ガッシと