Ya dace da mutanen da suke son yin barci a gefe ɗaya, suna da ciwon mahaifa da ciwon kafada, aiki tare da wayar hannu ko kai ƙasa na dogon lokaci, kuma sau da yawa gumi da tsoro zafi.Lokacin kwance a baya, tsakiyar ƙirar 3D malam buɗe ido, radian don tallafawa kai, wuyansa da kafada, barcin kariya na wuyansa.Lokacin barci a gefe, zane na musamman na reshe na occipital wanda ke rataye digiri 45 yana sakin wuyan wuyansa don a iya samun cikakken goyon bayan kafada.