意気いき
ikigomu

Godan Verb (mu)

1. to be enthusiastic (about); to be eager (to do); to be keen; to be intent (on); to be determined

Intransitive
はじめから意気いきみすぎると、途中とちゅう息切いきぎれするぞ。
hajimekara ikigomisugiruto tochūde ikigire suruzo.
You have to pace yourself or you'll choke halfway through.
Other forms: