Despite the late start, it looks like they enjoyed the rainy day workout. Hudson posted a hiking snapshot, jokingly captioned, "Day 5 We had no fun at all."
The 37-year-old actress is all about girl power, especially when it comes to her friendships. In October, Hudson spoke to ET about why her girlfriends are so important.
"Guys don't really talk that much, you know what I mean?" she explained. "They like to hang out, and that's important too. But women, we need to talk it out, and my girlfriends have been one of my strongest foundations of support."