"At the moment he's quite skinny and vulnerable, so I like to take advantage of that for a second. I feel like the older brother. I saw him a couple of weeks ago and this is the skinniest I've ever seen him! It's like, 'I feel somewhat responsible for you 'cause you're just like a child!'" Actor Liam Hemsworth admits he likes to beat up his brother, fellow screen star Chris, as he no longer has the muscles he had when he filmed superhero franchise Thor. Chris Hemsworth is currently starving himself for a new role in a film about the true events that inspired author Herman Melville to write Moby Dick.