I don't know really Dandy. In fact I've been talking to DH about it as I got a bit concerned that perhaps I was suffering from some sort of mysterious disease.
I did however exercise all the way through my pregnancy and they say if you do something enough it becomes a habit. Since giving birth I've continued to exercise at home, plus I have been eating better than I used to do. I think it is that, plus the breastfeeding that is making the difference.
I've been a bit hit and miss but generally I am doing my Davina work out 2 or 3 times a week, plus the wii once or twice. I'm walking quite a bit too. In the evening I do the ironing which used to be my prime pig-out time, but now the ironing prevents me from doing it.
I do feel better for it, and even attempted a very daring move at soft play the other day that I never would have done pre-pregnancy.
I really hope I keep it up this time, but my weight has fluctuated over the years so it wouldn't be the first time I've lost it all and put it back.