kokoro ga odoru
“one’s heart springs up”
“to feel very excited/stoked”
Other variations include 胸が躍る and 心臓が躍る. The word 躍る is a homophone of 踊(おど)る, which means “to dance”. Other than the expression above, “躍る” is also used in another phrase “躍り出る (おどりでる)”, which is usually used as in “トップ/先頭/首位に躍り出る” and means “(overtake others and) take the lead”.
Whenever I make a decision, I try to choose the option that makes me feel most excited.