Former hot mams wants to get fit again!!!!!!

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I am a 40-ish year old mother of 2 kids under the age of 5. I work full time, from home, and am SICK of not liking how I look. I REALLY want to get down to my pre-baby weight. I have about 15-20 lbs to lose. I am only 5'1" so that's a lot for someone with such a small frame. I know I can do it, I just need some encouragement and need to know that it IS POSSIBLE and I am not condemned to a life of feeling frumpy and middle aged. Please give me a pep talk and I will be so grateful!!