I'm new to the program and I have notices in some of cathe's vid's she use a black/gray stepper(super) I was told??? and black/green (org stepper)which I have. What is the difference?? super stepper is 15 1/2in ht and the org. stepper goes up to 10in max ht. Now I know this is a crazy question. And I am new..... But what is the function of the super stepper??? just for inclinces,chest, back, tricep, bicep, and other barbell/weight/firm work-outs??? Why would you need an super stepper? How tall is each black block 4in??? Keep in mind I'm new....... Please advise Thank again:7