Sprangan is a traditional Icelandic sport that involves jumping into a freezing cold river from a high cliff or bridge. It's like a mix of cliff diving and extreme cold water swimming. People do it for the thrill, the adrenaline rush, and maybe even to show off a bit. It's definitely not for the faint-hearted, but if you're up for a wild adventure and don't mind a shock to your system, Sprangan might just be the perfect activity for you in Iceland!