Here's why:
* Gerund: A gerund is a verb form ending in "-ing" that functions as a noun. In this sentence, "running" is the gerund.
* Gerund Phrase: A gerund phrase includes the gerund and any modifiers or objects that go with it. In this case, "on track" modifies the gerund "running".
The entire phrase "running on track" acts as the object of the preposition "for".