I'm skinny and underweight, and I have never exercised before. Would running be beneficial or more harmful for me? I'm male, 21, and my entire life I've been apathetic towards fitness. I'd go to the gym for a few times, and then give up. I just have no interest in exercising. 

Anyway so I decided that maybe I should take up running. I like running, but I've never seriously done it as exercise (I tried it a few years ago, but gave up after about a week).

I'm 5'5", and weigh 107 pounds. Would running be bad for me?