From 走(はし)り (hashiri, “連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 走(はし)る (hashiru).”) + 幅跳(はばと)び (habatobi).
はしりはばとび • (hashiri-habatobi) ←はしりはばとび (fasiri-fabatobi)?