Climb ev'ry mountain

I think the oldest must be part mountain goat. When hiking, he lithely bounds when the slope gets steep, and his footing is utterly sure. See the stone staircase in the picture above? He was at the top while I trudged, only a few steps up from the bottom still.

nimble
adjective
1. Moving or performing quickly, lightly, and easily: agile, brisk, facile, quick, spry.
2. Exhibiting or possessing skill and ease in performance: adroit, clever, deft, dexterous, handy, slick.

Oh, yes, that picture was taken at his beloved Pilot Mountain.