flˌɛksəbˈɪlᵻɾi vˈɛɹiz bᵻtwˌiːn ˌɪndᵻvˈɪdʒuːəlz, pɚtˈɪkjʊlɚli ɪn tˈɜːmz ʌv dˈɪfɹənsᵻz ɪn mˈʌsəl lˈɛŋθ ʌv mˈʌltaɪdʒˈɔɪnt mˈʌsəlz.
Flexibility varies between individuals, particularly in terms of differences in muscle length of multi-joint muscles.