(CBS4) — You can work off your Thanksgiving feast with a free visit to a state park on Black Friday.

(credit: CBS)

Colorado Parks and Wildlife has declared it “Fresh Air Friday” — and is waiving entrance fees at all 42 state parks.

This is the seventh year CPW has offered the free entry as a way to encourage people to head outdoors.

Friday is a state holiday, so the parks will not be fully staffed.

Plan your visit to a Colorado State Park: https://cpw.state.co.us/placestogo/parks