Sentence:  It is the one <WSD>exercise</WSD> 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 development that wins prizes . 
Meaning of the word marked with <WSD> tags:  the activity of exerting your muscles in various ways to keep fit