I think beautifulmess is right. I took up Martial Arts when I hit the 2 stone award and my weight loss slowed down massively, but I am so much smaller, despite the weight having slowed. 12 inches lost around the waist and I've gone from a size 30 to a size 18. It might change your body compostition a bit, but I think those who embrace Body magic seem to look better sooner and it's worth it. In the long run the muscle burns fat faster, and also I think feeling fit helps keep you motivated. Keep at it.