I hate my lungs
Seriously, I go out for a run and my legs could run for 2 miles straight and my heart's just fine...BUT MY STUPID ASTHMA. I have to stop like 3 or 4 times just over the course of a mile because my airways are constricting and my lungs hurt. What always stops me from running regularly is not the fatigue, it's the pain I feel in my lungs. I could be in such good shape if it wasn't for asthma.