I have pretty bad back pain now, and some days are easier for me than others. In general I walk much slower and I feel somewhat breathless and clumsy (especially on stairs) and prefer not to go too far. I had an awful time two weeks ago, I spent three days in so much pain I literally couldn't walk more than a few feet. Turns out it was caused by gas -- I guess I didn't have enough fiber, everything stopped moving, and the abdominal pain & cramping was absolutely severe. My husband nearly took me to the ER a few times, I was in tears. Most days it's just back pain and feeling heavy & breathless that stops me going on long walks.