"Zenryoku-tōkyū全力投球" literally means "full-power pitching" but describes giving your absolute all to any task. It's about putting 100% effort and energy into something, holding nothing back. EX. 「今回（こんかい）の期末試験（きまつしけん）は全力（ぜんりょく）でがんばります！」 "I'll do my best on this final exam!"