With Christmas over, you've probably got a lot of cardboard around the house from all those presents.
But before you throw those boxes into your recycling bin, you may want to watch this video.
Luanga Nuwame (aka the Homemade Game Guru), has created an elliptical trainer out of his spare cardboard.
Blogging on makezine.com, Nuwame says he was inspired to make the machine after seeing hoards of adverts for fitness products on the television in the run up to the holiday season.
One week and 15 glued sheets of double-corrugated cardboard later, he finished his creation which he's since named the Cardboard-O-Flex.
"Truthfully, I was unsure if this first attempt would stay together once my full weight was applied," he says. "But it has and I couldn’t be happier."
So, before you ditch the cardboard (and renew that gym membership), why not get creative with those boxes? Just don't spill any water on them...
Cardboard Box Office
Homemade Alone (01 of13)
Open Image ModalFilm: Home Alone (credit:CardboardBoxOffice.com)
The Life Domestic(02 of13)
Open Image ModalFilm: The Life Aquatic (credit:CardboardBoxOffice.com)
Wah Wars(03 of13)
Open Image ModalFilm: Star Wars (credit:CardboardBoxOffice.com)
'Yippee Kay-Aye Mama 'N Papa'(04 of13)
Open Image ModalFilm: Die Hard (credit:CardboardBoxOffice.com)
Castababy(05 of13)
Open Image ModalFilm: Castaway (credit:CardboardBoxOffice.com)
The Cradle Of Doom(06 of13)
Open Image ModalFilm: The Temple Of Doom (credit:CardboardBoxOffice.com)
'Houston, We Have A Poopy'(07 of13)
Open Image ModalFilm: Apollo 13 (credit:CardboardBoxOffice.com)
Bubbalien(08 of13)
Open Image ModalFilm: Alien (credit:CardboardBoxOffice.com)
'You're Gonna Need A Bigger Baby' (09 of13)
Open Image ModalFilm: Jaws
The World's Smallest Indian(10 of13)
Open Image ModalFilm: The World's Fastest Indian (credit:CardboardBoxOffice.com)
The Good, The Bad And The Dribbly(11 of13)
Open Image ModalFilm: The Good, The Bad And The Ugly (credit:CardboardBoxOffice.com)
'Papa La Vista, Baby' (12 of13)
Open Image ModalFilm: Terminator 2, Judgment Day (credit:CardboardBoxOffice.com)
Goo Goo Gaa Gaa-Rassic Park(13 of13)
Open Image ModalFilm: Jurassic Park (credit:CardboardBoxOffice.com)