have recently started a good, healthy diet to lose weight. I am 5'2 and I weigh 325 pounds. I started dieting about two months ago, and I use a regular excercise program that includes running up and down the stairs in my apartment building. I weighed myself yesterday and I have found that I have lost over 25 pounds since I started this diet two weeks ago. While this is great news, I can't help thinking that maybe I am losing weight too fast and also, should I change my excercise program to include a different variety of excercise, or should I stick with the one that I am on now? Also, I do 15-20 minutes of warm-ups and cool downs. Is this also alright to do? Thank you.