Hello, I am 59 male, started using a treadmill a month ago for cardio walking. I had a single cabg 3 years ago and need the rehab . I am at 1 mile walking for about 30 minutes but now I am having pain in the back of my ankles, both sides. start at just behind the joint and goes up about 4 inches of the leg. It is now getting so bad I have to reduce the speed to under 2 mph. I do not use the lift at all just flat walking. I also must say that the last 2 weeks have been sporadic due to power outages. After being off the mill for 1/2 hour it hurts if I press on the back of my ankle. I really need this walking. I am about 35 lbs overweight, have type 2 diabeties, hemochromatosis , fibromyalgia , Osteosporosis, Osteo Arthritis and dont forget Low T