Best way to lose weight and tone up?

hiya I'm a fair bit overweight (15st and a half) and have been for years and I now wanna do something about it I now eat healthily and do loads of excersise what else can I do all advice welcome? ps I have been at it for like 2 months and have only lost like 3 lbs ? am I doing something wrong
Best way to lose weight and tone up?
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