HEEEELLLPP

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Ok so I’m a 16 year old girl with troubles. I used to be very fit, chubby but still fit and now that I’m looking to improve my muscles, fitness and body, I’ve gotten into some trouble. Ive been doing my fitness classes and that’s awesome but I’m SO SORE! Stretches aren’t doing much cause I’ve pushed my self over and over. Does anyone know how to improve muscle mass and help get over the soreness? PLEASE HELP A GIRL OUT!