I think you need some help. I don't mean that meanly. If you get tired raising you arms, then raise your arms. Any movement that makes your heartrate go up helps you lose weight. Also talk to a doctor about your weight problem, that is if you aren't already. Since you are so overweight your health insurance might cover bariatric surgery. That is what severly obese people have, it make your stomache like 1/4 the size it was before.