Recently started exercising.....

Ok so I have lost over 100 pounds by changing my diet. I still have alot to lose and have recently been given the ok by my doc to start walking. I have been exercising a littile while now and I never eat back my exercise calories. So here is the problem.....since I started exercising (all I am doing is walking on a treadmill for now)....I have gained weight. Is this normal?

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