Inikeza indawo yokugcina ama-dumbbell okuqeqesha isisindo samahhala ekuqeqesheni okuphambanayo, indawo ye-2-Tier yamapheya angu-10 wama-dumbbell angu-20 anesisindo esijwayelekile, futhi isikhala esengeziwe phezulu sivumela ukugcinwa kwezinsiza ezisizayo njengamabhola okuqina, amabhola emithi, njll. Ngenxa ye-DHZ's uchungechunge olunamandla lokuhlinzeka nokukhiqiza, uhlaka lwesakhiwo semishini siqinile futhi sinewaranti yeminyaka emihlanu.