Justin Timberlake has revealed that In Time is the toughest job he's had to do.
The pop star-turned-actor does a lot of running in the time-travelling sci-fi film, which also stars Amanda Seyfried and Olivia Wilde.
"This is physically the hardest job I've ever done, including world tours. We're on set for 10 hours to 12 hours and ten of those some days, we're running," he told Collider.
"I was trying the other day to figure out if there was a movie where there was more running other than like Run Lola Run, Forrest Gump maybe."
Justin and Amanda play Bonnie and Clyde-style bandits in Andrew Niccol's sci-fi thriller - which opens in UK cinemas on November 1 - on the run in a futuristic world where no one ages and time has become money.
"I feel like the running is a huge character of the movie, because it relates to the time that you don't have to live. Where my character comes from, we don't have time to walk at a normal pace; we have to move quickly," the 30-year-old explained.