I never have reservations about doing anything as long as I'm being paid.
I'm an actor. If you had said to me before I started acting that I'd get two bites of the cherry - you would do things that people will remember forever like 'The Brothers' which I did in the '70s and now 'Doctor Who' - I'd have been overjoyed and I still am.
I like challenges that test your ingenuity.
Nobody can fail to lose weight in the jungle, unless they've got a secret stash of pork pies somewhere.
One way of watering down the effects of violence is to approach it in a more lighthearted way. I don't mean to say that you laugh when somebody has their arm sawn off, but you can diffuse fear with humour.