A phrase is a group of words that does not contain a subject and a predicate, with ‘predicate’ referring to the part of a sentence that contains the verb and gives information about the subject.

The rule, per Purdue OWL, is that you should not put a comma between the two verbs or verb phrases in a compound predicate. "John" is the subject of the sentence.

A phrase is a group of words that does not contain a subject and a predicate, with ‘predicate’ referring to the part of a sentence that contains the verb and gives information about the subject.