Nettleton was a distinguished mountaineer who was elected President of the
Ladies' Alpine Club (1920–1922). She excelled at rock climbing, both in the Alps and on short technical routes in the UK. Her greatest alpine achievement during those years was leading the traverse of the
Aiguille du Grépon in 1903, accompanied by her husband and a porter. in the introduction to his book he adds that "The traverse of the Aiguille de Grepon at Chamonix is just as much rock-gymnastics as the ascent of Kern Knotts Crack on Great Gable". She led Kern Knotts Crack at the age of 23, only a year after
Owen Glynne Jones had made the
first ascent in 1897. ==Archery==