There are a couple of films that I've done, where I've had to get on a horse and wear a pair of tights, so that helped. But, nothing could have prepared me for the fun of wielding magic like Merlin does, especially in the perverted mind of Chris Chibnall.
I got to grow up in a situation where drugs were demonic. To watch your dad go through heroin withdrawal is something that would keep you from doing any of that yourself.