My husband enjoys walking the coast paths around where we live in Cornwall. Up until a few weeks ago, if i went with him he would choose relatively flat terrain because i would be such a moaning minnie about having to climb steep slopes - i just got so out of breath. Yesterday we went for a brief ramble round St Agnes, which has some incredibly vertiginous slopes. To my astonishment i practically flew up what my app later told me was the equivalent of 24 flights of stairs.
What a difference 6 weeks makes!
(Pic shows Him-indoors)