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Reynolds ran the event on Sunday in aid of Michael J. Fox's Parkinson's Disease charity Team Fox.
He revealed last month that he was taking part in the charity run for his father, who has suffered from Parkinson's for 15 years.
"I'm still standing. I'm very excited about that," Reynolds told People after the race.
"When I saw Michael J. Fox on Fifth Avenue, I gained about 15 pounds in goose bumps. It kind of pushed me through the last six miles or so.
"[During the race] I thought a lot about my father and Michael and the 500,000 other people afflicted with this awful disease in the United States alone. I ran for those who can't."
The Just Friends star joked he was planning to eat his "own body weight in raw dough" to celebrate finishing the race.
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