I just tonight went for a walk for the first time in a long time. I am in poor shape exercise-wise, although I am not overweight. I have chronic anxiety problems that have gotten worse recently and wanted to give exercise a try. I walked maybe a mile I think. I did get anxious on the walk--which did not surprise me. Walking away from the house would get me anxious no matter what time of year or day, it's a part of agoraphobia. Since I start to breathe heavier from the anxiety it's hard for me to gauge whether my tightness of breath is from anxiety, exercise, or the cold. I started getting more anxious as I wondered whether it was even safe for me to begin exercise while inhaling all that freeezing air, wondering if it was constricting my lungs too much. When I got back home I checked my Apple weather widget--which says it's 28 F outside. I was well bundled and warm enough, except for my face and possibly lungs? Any walkers or doctors or combination of the two have an idea about whether it's bad for you to walk in the cold?