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Anonymous
>>298071 I sense someone who doesn't exercise at all, yet again. Do cardio/HIIT, work out two to three days a week working different muscle groups each day, work abs once a week.
You can't spot reduce. You are thin because you don't exercise, but your back doesn't have the muscle to stop it from hurting when doing crunches. Standing up and walking around more will help. Any kind of actions that you do standing up will help to strengthen your back.
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