Jared Harris loves doing fight scenes.
The 40-year-old actor - who is renowned for playing David Robert Jones in TV series 'Fringe' - particularly enjoyed Fighting in scenes as the villainous Moriarty in 'Sherlock Holmes: A Game of Shadows' because he used to box when he was younger.
Moriarty has more of a boxer's approach. Robert Downey Jr. has his martial arts training and he has that very short, direct style of blocking and punches.
He said:"It's the bit that reminds me of being a kid. I went to English drama schools, and you train in stage combat, sword Fighting and physical combat.
"I used to box when I was younger, so I understand the weight distribution of doing all of that.
"Moriarty has more of a boxer's approach. Robert Downey Jr. has his martial arts training and he has that very short, direct style of blocking and punches."
He believes Robert - who plays the titular Sherlock - plays an important part in developing Moriarty as a character.
He added to Collider.com: "Honestly, a huge part of the character was played by Robert. When you're doing a Shakespeare play and you have to play the king, one of the axioms of the theatre is that you can't play a king, people must treat you like one.
"The responsibility is for everybody else to achieve that element of the performance. The respect and the sense of danger and menace that Sherlock Holmes attributed to Moriarty was a huge part of it."