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: