I am by no means in perfect shape, but for the past 8 years I was a runner who became a full-time cyclist last October. My wind is pretty good. But man, these last few weeks, I am dying on hills. Very hard to breathe on the ascent, and my chest is very tight. It feels as if I smoked a pack of cigarettes the night before, which I haven't. Does this sound like allergies to anyone? Or has the air quality in New York been especially sh!tty lately? Or am I actually having a heart attack?