Cookery writer and presenter Nigella Lawson has revealed that she burns calories in the privacy of her home by running on a treadmill in just her bra. "Exercise is the only thing that means I can still eat. It's about keeping the status quo,' the Telegraph quoted her as saying. "I've got a treadmill upstairs. I lock the door so no-one can come in. I just wear a bra and a pair of trainers and I play very loud music - disco and 1980s - and sing. "I've got a terrible voice. It clears my head because I'm such a frantic worrier. But if you sing really loud, even for just 15 minutes, those worries can't take hold,' she added.