because you're using your leg muscles
because you use your leg muscle
conj pro:per part det:poss n n
because you're using your leg muscles .
b ɪ k ʌ z WORD_BOUNDARY j ʊ ɹ WORD_BOUNDARY j uː z ɪ ŋ WORD_BOUNDARY j ʊ ɹ WORD_BOUNDARY l ɛ ɡ WORD_BOUNDARY m ʌ s ə l z WORD_BOUNDARY
b e c a u s e WORD_BOUNDARY y o u ' r e WORD_BOUNDARY u s i n g WORD_BOUNDARY y o u r WORD_BOUNDARY l e g WORD_BOUNDARY m u s c l e s WORD_BOUNDARY