Sentence:  It is the one exercise that drastically influences the definition of the thighs at the hipline - that mark of the champion that sets him apart from all other bodybuilders - a criterion of muscle `` drama '' that is unforgettable to judges and audiences alike - the facet of muscular <WSD>development</WSD> that wins prizes . 
Meaning of the word marked with <WSD> tags:  (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level