Cathe - In the STS workouts you use a chair, throughout. How high is that chair? (particularly as it relates to doing Legs workouts). I live in an apartment, and don't have a dining table or anything, so I don't have a chair (just tall barstools, which clearly won't work). I will have to modify using a step (I have old Firm steps for this), but I would like to know how high the seat of the chair you're using is, so I can gauge how deep I should be going. Thanks!!!