Final answer:
The given group of words is a complete sentence, containing a subject and a verb, and conveying a complete thought.
Step-by-step explanation:
The group of words "A jog through the park will help you release stress from the day’s worries." is a complete sentence. A sentence should contain at least a subject and a verb, and express a complete thought. In this case, the subject is 'A jog through the park' and the verb is 'will help'. The sentence expresses a complete thought, hence it is not considered a fragment.