We have had several healthy employees practice with the Matheson bench. There are references in the instructions that there are 7 holes in the upright back supports that allow you to vary the height for different evaluees. It implies that you use 5 bars. Do you use 5 or 7 rear back support bars in testing. The employess that have tried it with 7 have all NOT met the crieria for assembly and I am questioning why??

Jean Graf OTR