Which word does the prepositional phase "without a break" modify?

Besides the health benefits, Chopper likes to chew sticks more than furniture.

Example:
In the given statement, "The Caribbean sea is a great location for deep-sea fishing." The phrase "a great location for deep-sea fishing" is the adjective phrase of the sentence.

Phrases are group of words that doesn't have a complete thought unlike clauses that can stand alone since it has a subject and predicate whereas a phrase doesn't.
An adjective phrase is one type of phrase to describe a noun or pronoun subject in a sentence. Also is adverb clause.