Mark Zuckerberg has issued you a physical challenge.
The Facebook founder has pledged to run 365 miles this year, or one mile per day, and has invited the social media community to do the same.
"This is a lot of running," he wrote on his Facebook page, "but it's not a crazy amount. It's a mile a day, and at a moderate pace it's less than 10 minutes of running per day.
Zuckerberg set up a Facebook group called "A Year of Running" for people to discuss their "running adventures" and to post occasional updates on his own efforts.