Hi. In two thousand thirteen I joined gym when my weight was ninety three Kg ..within one year I reduce it to seventy kg with the help of extensive cardio and diet. Than I start weight training and eating protein rich food to built muscles which cause a jump in weight to eighty kg within six months. Everything was normal but I don't know what happened but in last six months I was having severe severe pain on my knees while running, cardio and using stairs. Firstly I ignore thought that it might be temporary but recently it's getting sore as I am having little bit of pain while bending my knees also. Kindly suggest what should I do. Regards