I have 4 bulging disks in my back (L4 - 6) and arthritis in my knees. I had been doing a walk at home exercise program and lost 26 pounds before my flare up. And stopped exercising for about 4 months. I still need to lose about 30 more and wonder if I should continue with the walk at home - it is quite vigorous. I had a steroid shot in my knee last week and am scheduled for a shot in my back. I need to do something that makes me sweat or I do not lose the weight.