"It's all historically accurate, it's not been strong armed in there or anything like that," he joked. "I am not playing the hunk, everyone relax.
"I am the hunk's older brother, that's why they cast me. But I do get my bum out. It's not the first time I've done that, I'm quite used to it.
"But it's the first time I've done it when I've been 15 years older than everyone else, so there are a few reps that were needed to be done before I went to work, a bit of tensing. A bit of sucking in. But it's all good."
Marshall's character is the patriarch of the Parker family in the series. He's described as an enthusiastic man who hopes to turn Sanditon into a fashionable seaside resort.
The show also stars Rose Williams as main character Charlotte Heywood, a young and spirited woman who embarks on a relationship with Sidney Parker (Theo James).
"I'm very excited that we are bringing the world of Sanditon to the TV audience with such a brilliant ensemble cast," screenwriter Andrew Davies previously said.
"It's been such fun to develop Jane Austen's fragment into a series – now I'm eager to see our exceptional cast bring Sanditon to life."
Sanditon begins this Sunday (August 25) on ITV at 9pm.
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