Hey, first off I would like to say congratulations on losing 25 pounds! It's hard, and you're doing great! The fact thta you've weighed 180 for four weeks isn't a bad thing either - you are not gaining weight! It's good that you have the long walk to help you. You might want to try power walking, or jogging. Start off by walking for five minutes, then jog for three, walk for five, etc. for the first couple of days. Then increase your jogging times, and decrease your walking times. It will help. You may also want to try some sports such as skating, snowboarding, skiing - things that you can do and enjoy with your friends and get in better shape while you're at it!