Hi dear, hope you are fine. You have low metabolism ,you need to boost your metabolism by not just doing only exercise but also having healthy diet , what are you eating is directly effect on your body. It does not mean you are eating unhealthy and for making compensate you are doing lots of exercise. Dear, you need to understand that only doing exercise is not a complete solution for weight loss, you just need to see all aspects like healthy diet, regular exercise and living in healthy lifestyle... These all are matters. Consult Dietitian . and you have lumps in right arms, I concern that they are fat deposition but it will be better if you visit doctor once. Hope I have answered your query. Best wishes