Here to lose weight 🀞🀞🀞

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Hi everyone, I've joined this app and linked it with my fitbit. I'm desperate but focused to lose weight and wondered if anyone else on here is doing the same. I have 3 stone to lose and it would be great to have a losing weight buddy. Im sticking to the 1200 calories a day 6 days of the week and in 3 weeks I've only lost 1.5lb, I'm also doing the couch 2 5k 3 times a week along with some yoga and strength exercise. What am I doing wrong??? I cant seem to lose anything!!