ran as hard as possibleThe past-tense phrase 一生懸命走った means someone ran with all their effort. 一生懸命 means “with all one's might” or “as hard as possible,” and 走った is the past tense of 走る (to run).
JA: 彼女はバスに間に合うように一生懸命走った。
EN: She ran as hard as possible so she wouldn't miss the bus.