Without going into too much detail (detail that I don't understand completely myself) but I have three compressed discs, a bulged disc (L1 and down) and a constricted spinal column (not quite sure what that is, but it translates to excruciating (sp) lower back pain and sciatic nerve pain all the way down lower back and left leg). I am over weight and need some advice on low-impact exercises. Walking feels good (typically) but I need some way of strenthening the back and getting rid of the gut. I am trying to work on the diet and walk when the pain isn't bad enough that I am constrained to a cane. Any one have any ideas?