Hi to those people who fortunately looking for the right answer.
I'm ahead of this question for about 3 years. (2019, about to be 2020)
So Hi :)
Answer:
present participial phrase containing a prepositional phrase
Explanation:
"Balancing on his tiptoes" is the present participial phrase (containing -ing).
"on his tiptoes" is the prepositional phrase.
