What stuntgirl said about weight lifting. It's currently working for me. The more muscle you build the more calories you will burn without putting in the effort. Plus it does make a seriously niceanyour body, it's been 4 weeks since I started and everyone has noticed.
I have lost 3.5 stone and kept it off for 6 years. I didn't go on a diet, I think the word 'diet' is setting you up to fail. I just changed the way I ate. I still did and still do eat crisps, chocolate, cake, takeaways, bread etc just not in any quantity that I did then. I was really overeating, I would have up to 6 slices of bread a day, chocolate and crisps every day and cheese every day too - that's before you even started on meals!
So I cut all those extras out. I slightly lowered my overall carb intake, upped my protein, and had apples instead of cakes for snacks most days. That was all. Still ate spag bol, lamb chops, sausage and mash for dinner and if I couldn't resist had a bag of Maltesers..all normal.
8 months later I went from a very tight size 16 and 14 stone to a lose size 14 and 11.5 stone.
This is still slightly above what I should be, so I started exercising about a year ago and now do weights. I have changed my diet again, only this time the only thing I am doing is lowering my intake of sugar, so instead of 5 sugar teas a day I have just the one, I have chocolate/cake just once a week and have avoided cereal, fizzy drink and all those biscuits (and watch out for yoghurts and low fat/fat free food, they are all sugar!)
I started that 4 weeks ago, I have lost 8lbs and 2 inchs from my chest, one from my waist and 2 from my hips! Now a small 12/big 10, 10.10lb (5ft 8).
Sugar is baaaaaad !