Ngeminyaka yesipiliyoni kuma -treadmill wokukhiqiza izinja ezithengiswayo , i-mecanmed ingahambisa uhla olubanzi lwezinja ezithengiswayo . zezinja ezithengiswayo zingahlangabezana nezicelo zesikhathi esiku-inthanethi mayelana nezinja ezithengiswayo . Ngaphezu kohlu lomkhiqizo olungezansi, ungaphinde wenze ngokwezifiso ama-treadmill akho ahlukile ezinja ezithengiswa ngokuya ngezidingo zakho ezithile.