I like the term gnarmac ‘cos it’s exactly how I train.
Bridleway from home avoding rat run, Rural B road – Chiltern double track avoiding rat run, rural B road, bored bit of woodland bridleway, battered, rural B road, double track hill KOM attempt (fail), rural B road, bridleway home.
My gnarmac machine is a rigid 29er – it’s not about the bike more about riding where you want.