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I want to tighten my tummy muscles and build or tone my upper arms, as well as some form of exercise for my breasts. I know that exercises for the breasts do not make them smaller after childbirth and breastfeeding, but at least it will help. After the birth of my daughter about 10 months ago, I have been struggling to get back into shape. I started walking, and previously, before the pregnancy, I used to run. I just need some exercises to ease into shaping and toning my body. I have a set of dumbbells at home, but I'm not exactly sure what exercises I can do. Please help?