Day One... Wow Im outta shape!

So yesterday was day one of my journey to loose 100lbs. I cant believe how out of shape I really am, I could only do 10 lunges on each leg and 10 squats and Im paying for it today. As for my cardio I went for an hour long walk. And my meals were as follows: breakfast, a low fat yogurt and half a banana. Lunch a lean cusine. Snack, rasins, veggie chips and a sting cheese. Dinner, lean cusine. I feel great! Im very proud of my first day. No if I could just shake this headache then I will be good to go.