Noun
(idiomatic) One who is especially lively, continually active, or industrious.
(idiomatic) The energy associated with being lively, continually active, or industrious.
Source: en.wiktionary.orgI was always a great bundle of energy. As a child, instead of walking, I would run. And so running, which is a pain to a lot of people, was always a pleasure to me because it was so easy. Roger Bannister
That's where this exciting bundle of energy and joy named Johnny Olson made his entrance and ultimately did the announcing. I had never seen anything like what I was involved in for the next 15 minutes! Randy West
When I was 3 my parents put me in gymnastics because I was a bundle of energy and they just didn't know what to do with me! They put me in a Tots class and I just fell in love with it. Shawn Johnson