Cardio discomfort

A reaction to heat. You might be experiencing cholinergic urticaria, actually. This is a rise in body temperature that leads to itching, swelling, and similar reactions in your body. Usually, if you have this effect after exercise, you might also have the same reaction in hot tubs or saunas. You can usually get rid of the hives with antihistamines. You can also reduce workout intensity and avoid exercising on days that are super hot.

I'm going to look into that. Thanks for sharing. I really don't like the way I feel when that happens, although it doesn't last than more than 10-20 minutes after the workout, usually. It does make cardio workouts, and enjoyable hikes, pretty stressful.

Luis F.
I just came back to the hotel from a long day walking around Hong Kong, in temperatures around 40 degrees F.; my legs are surprisingly red, and with an anoying feeling of discomfort. It was very much the feeling Kristen described in her mail, but without the heat factor involved. I am really concerned, and considering seeing a doctor; this is a first time event.