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Chubbysmall! You should definitely ask your doctor about exercise, especially since you may have inherited your Dad's disorder. If it were me, I'd ask to be tested. You mentioned pain from exercising, and although minor aches and soreness are normal, extreme pain is not, and if the exercise is too extreme for you, it could lead to muscle damage. Definitely consult a doctor first, with your family medical history in hand! Aside from the exercise, I wish you the best in having success with healthy eating! This is a very welcoming community, so jump right in! Good luck!