How can I lose belly fat with sit-ups?

I can not do squats because my back hurts and I do not have much time for exercise, but I really need to lose weight. I eat well, but I can not seem to lose weight and had my thyroid checked and the fine so I'm not sure what is goin on.

Do cardio, lots of cardio, if your back hurts, and then the big swimming the perfect sport for you, will work the abdominal muscles while burning fat, keeping your back super safe, ehhh Did someone say perfect answer?

How to lose belly fat | How to lose belly fat quickly