Staying in shape to keep up with his bouncing baby boy, Josh Duhamel headed to the gym in Brentwood, California on Monday morning (October 14).

The "Safe Haven" star wore a gray T-shirt, darker gray pants, and a black backwards ballcap as he headed inside to work on his fitness.

This past weekend, Josh, Fergie, and their baby Axl Jack headed to the Ferguson family vineyard to celebrate harvest day.

Sharing an adorable photo of her father with the little guy, the Black Eyed Peas frontwoman tweeted, "Grampas favorite bundle of grapes in the vineyard."