Don't worry, it's all part of his new film, Paranoia.
When were momentarily concerned when we originally saw this photo of Liam Hemsworth sprinting down a run-down alley in the dead of night.
We wondered if he'd got involved in some sort of dodgy business, or perhaps dared to suggest that Miley stop taking photos of herself in the mirror, only to have her set the dogs on him.
Luckily, he's actually just filming a scene for new film Paranoia, which sees a businessman force his younger collague to spy on a corporate rival.
Judging by these photos, that little plan doesn't go so well.
Now, we know from experience that's it's very difficult to look good while running - so kudos to Hemmo for making us go 'phwoooar' even here.
Re you enjoying his sprinting style?