I have had back problems for years (probably due to fractured vertebra in car accident in my 20s). I know I am overweight and I am struggling with painful knees due to arthritis. I am however doing what I can to eat more healthily and have been excercising at the gym on the bike, aqua aerobics and swimming. Nontheless I am trying to get a grip with my back pain. It can be a bit like my knees, too much inactivity and I get stiff but once moving around I am reasonably ok. Other times li Like if I go for a walk I can only describe the sensation as some kind of spasm which I keep walking through but it is very painful and can really slow me down. Has anyone else experienced this kind of spasm pain and any advice on what to do about it?