I-dumbbell rack inezingqimba ezintathu, ezingabamba ama-dumbbell amaningi, kufika kumapheya angu-15. Amathreyi anemibala ehlukene enza okokusebenza kubukeke kuthambile futhi kuheha amehlo. Ikhona elingezansi liphinde lamukele isakhiwo esingunxantathu, esinikeza ukwesekwa kwamandla aphezulu ku-rack futhi izinzile kakhulu, idizayini ye-elliptical tube, enikeza umuzwa woketshezi owengeziwe nokwandisa ukunethezeka kokuqeqeshwa.