Answer: leapfrogging

AnswerCrossword Clue
LEAPFROGGINGNew York bus driver's activity
LEAPFROGGINGCold-blooded children's play activity?
leapfroggingLEAPFROG, to jump over with the legs apart
leapfroggingPerform such a vault
leapfroggingPass over (a stage or obstacle)
leapfrogging(of a person or group) Surpass or overtake another to move into a leading or dominant position