활력소가 · 활력소를
source of energy, tonic, something that brings life
Example
주말 등산은 저에게 삶의 활력소예요.
Hiking on weekends is what keeps me energized in life.
Word parts
활 lively+력 power+소 element
Literally 'element of lively power'; -소 = element or factor: 영양소, 요소.