ɪnðə nˈaɪntiːnhˈʌndɹɪd sˈɪksti fˈoːɹ bˈʊk fˈaɪndɪŋ bˈæləns baɪ dʒˈɪɡi bᵻɹˈɑːɹdi, ðɪ ˈɔːθɚ mˈɛnʃənz θɹˈiː lˈɪmɪɾɪŋ fˈæktɚz: ˌɑːkjʊpˈeɪʃənəl dᵻmˈændz, mˈuːvmənt dᵻmˈændz, ænd tɹˈeɪnɪŋ ˈoʊvɚsˌaɪts.
In the 1964 book Finding Balance by Gigi Berardi, the author mentions three limiting factors: occupational demands, movement demands, and training oversights.