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I tried doing circuits. My chest gets really tight and I can't breath. My lung collapsed 6 years ago. I don't know if that's the cause or if I just developed asthma or something.

I can run a little less than I mile before I start weezing (outdoors) and a lot longer in. It's unfortunate because I am starting to gain a lot of weight. I used to be really skinny and like 135lbs. Now I'm probably close to 150-160 with it being fat.