Isihlalo Sokuphumula I-YO ilandela imigomo ye-ergonomic yokuhlala okhululekile nokuhlala imigqa yejiyometri emsulwa eyakheka kalula izinhlamvu ezithi "YO". Kwakha umehluko phakathi kokwakhiwa ngamapulangwe okukhulu, okwenziwe ngabesilisa kanye nendwangu ekhanyayo yesihlalo nesangemuva, eyenziwe ngezinto ezenziwe kabusha eziyikhulu. Ukungezwani kwendwangu kufinyelelwa ngokufakelwa kwemicu (okubizwa nge- âcorsetâ). Isihlalo sokuphumula sihlanganiswa yisitulo esiba yitafula eliseceleni lapho ligijimiswa ngo-90 °. Uhla lokukhetha imibala lubavumela bobabili ukuthi bangene kalula ngaphakathi kwezitayela ezahlukahlukene.