Arms and back??????

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So my gym teacher told me that doing some backward weight lifting will help me tone my arms. I have been doing them for a long time although i have skipped some days and i see no improvement. I dont want to tone my arms i want to loose fat in my chest,Back and upper arm area, i dont know what to eat and what exercise to do, but i want to loose weight fast. Since summers here. I feel awfully self-conscious about these. Does anyone have any inputs? Thanks in advance