The puppets generally have an armature inside of them to keep them still and steady to constrain their motion to particular joints.
ðə pˈʌpɪts dʒˈɛnɚɹəli hæv ɐn ˈɑːɹmətʃˌʊɹ ɪnsˈaɪd ʌv ðˌɛm tə kˈiːp ðˌɛm stˈɪl ænd stˈɛdi tə kənstɹˈeɪn ðɛɹ mˈoʊʃən tə pɚtˈɪkjʊlɚ dʒˈɔɪnts.