Sentence:  Used in <WSD>several</WSD> sets of high reps once or twice each week it will not be long before your entire upper leg takes on a razor-sharp definition in which the muscles look like wire cables writhing and twisting under the skin ! 
Meaning of the word marked with <WSD> tags:  (used with count nouns) of an indefinite number more than 2 or 3 but not many