loose-limbed 
adjective
Supple and physically relaxed: his loose-limbed, athletic body exudes fitness and energy...
- The word yoga conjures up images of long-legged, loose-limbed babes in clingy tights.
- Her special place in the Broadway cosmos did have something to do with her dancing, loose-limbed yet precise.
- Three loose-limbed models slink into the cramped conference room next to his headquarters.
Synonyms
supple, limber, lithe, lissom, willowy, flexible, pliant, pliable, loose-jointed;
agile, nimble, deft