The short answer is that the moment you start burning more calories than you eat, then you will lose weight.
How many calories you need to burn depends on how much you're eating, how much you're exercising and how fast you're trying to lose that weight.
Too fast usually isn't a good idea. What's gotten you fat is lifestyle habits and to get the weight off and to stay off you need to replace those lifestyle habits with better ones, which takes time.
To lose one solid pound of weight, you need to burn 3,500 more calories than you consume.
17,500 sit- ups burns about 3,500 calories( but they're real annoying to do)
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