Now I went out the other night and I had to go up and down steps and I park the car a block away so I had to walk back to the car. When I got home my calf were killing me so I thought it was just because I have not worked out my legs in a while and it would go away. It has been 2 days and I can hardly walk when I stand up because of how the back of my legs hurt so bad and bending them back and forth to walk is really hard. It will not stop.