I have a bulged lower disc above my tailbone. If I go a week without exercise the muscles (butt & lower back) start to get tight and put pressure on the disc, thus on the sciatic nerve. The doctor told me I will have to live with it for the rest of my life. I find that exercise is the best medicine. I have been following Mark's PBF 2x a week without any sciatica except when I traveled to Asia where exercise was hard to come by. After just one day back in the gym my back pain was almost gone.
Someone else said CrossFit - no joke. I agree - any type of exercise will keep your muscles loose - not just cross fit though.
SW (207lbs) 8/1/2012
Primal Since 8/1/2102
Bike commute to work 20 miles/day ~ rain, shine, or snow.