I remember my very first "fell training session", Mam Tor - Lose Hill ridge from Castleton.
Bowled out of Castleton full of beans and hit the Winnats Pass thinking i'd skip up there... could barely get above walking pace up the rough grass, so moved onto the road, and didn't fare much better.
Went ok along the ridge, but was a bedraggled state running back down the road from Hope to Castleton a while later.
I wasn't unfit either, i'd had my last pro fight only 4-6 weeks before, and had strong calves and ankles... but quickly realised i was going to need some serious training.