If I burn 300 calories a day on an elliptical machine is it worth it?

Right now I am doing 20 minutes, or 300 calories, once a day and I'm wondering if I will lose weight? Right now I'm 5'4" and 225lbs so that's all I can handle without collapsing. Any advise for me? Also I'm pretty sure I have a large bone frame because when I wrap my thumb and middle finger... show more Right now I am doing 20 minutes, or 300 calories, once a day and I'm wondering if I will lose weight? Right now I'm 5'4" and 225lbs so that's all I can handle without collapsing. Any advise for me? Also I'm pretty sure I have a large bone frame because when I wrap my thumb and middle finger around my wrist, there's about 1" space. Thanks.
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