Answer:
Your answer would be that the predicate is the VP "kept her heart rate up while waiting for the light" and the participle is "running in place".
Step-by-step explanation:
The predicate is everything that is not the subject. It is the part of the sentence or clause that contains a verb and states something as regards the subject. In this case, the VP "kept her heart rate up while waiting for the light". In order to identify it, you should first identify the subject by asking the question who/what verb(ed)? Who kept her heart rate up while waiting for the light? The answer is "the woman". Therefore, the rest of the sentence is the predicate.
Moreover, the participle phrase is "running in place". This is a present participle as it ends in -ing. Participles always function as adjectives, adding description to the sentence. In this case, the participle phrase descibes the noun "woman".