Lost 8 pounds..waist measurements has not change :(

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I use to be a 140 and now I am 132...trying to lose 12 more pounds but my waist is still 28... why? Trying to get it at least to be 26. I do an 1 hour of cardio a day. Should I start weight training. I did lose boobs...so sad. btw i am 5'5.