sinewy

The sinewy muscles of his arms bunched together fiercely at his shoulder.

There was some talk, that maybe, just maybe, this sinewy kid would be a hell of a ticket asset.

“Fibrous” applies metaphorically to mental qualities; it means strong, sinewy—high talents, just below genius.

His sinewy hands were clenched on his knees, and his moccasined feet crossed and uncrossed themselves as the hearing progressed.

Tall and sinewy, their stern faces and flashing eyes proclaimed their courage.

I always pictured them stern bearded men, with brick-red faces and sinewy limbs.

He was a quiet, rather untalkative man, lean and sinewy, sun and wind bitten.