Activities
Great Efforts
A lively leap is what you do when you do a lot of activities and making great efforts to do them. It's no normal leap, it's a lively one, after all.
かつやく
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
リレーのレースで、彼は五人をごぼう抜きにする活躍をみせ、彼のチームは見事一等賞に輝いた。
In the relay race, he beat five runners in a row and his team won first place.