What does it mean if I can't keep my upper back straight ?

Perhaps it would help the back issue, too, but the starting position is important, too, of course, if what you are trying to use there is the ‘push up’ starting position (as in Charlie’s GPP DVD). But I am not clear on this, it’s confusing. I don’t think the starting position helps you in what you are trying to achieve. Overall, it’s not as bad as you think!