I have been trying to lose weight. I am 5 ft. 3in. I now weigh 175. I weighed 220 only 3 months ago. I am trying to lose 31 pounds but I seem to have hit a block. I am not losing weight. I currently power walk 2 hours a day and in the afternoon I burn 1,200 calories on an eliptical. I do this in sections of 30 min. burning 400 caloires. In between those sections I do some strength training. What am I doing wrong? I eat around 1,000 calories or less a day. Please I need help!!!!!