I can excersize in a way: I can have a long walk every afternoon, but I can't run. Just cross walking is fine with my face, as long as it's not too hot outside. I react very strongly to foods unfortunately, although antihistamines do help to take the sharp edges off. I don't always flush straigh away from some foods, like creme brulee (custard like, sairy with egg yolks and sugar and vanilla), but the next day(s) my skin is more red and prone to flushing and I even get some p&p's from sugary foods.
I find that when it is warm outside I can handle that 'natural' warmth better then central heating warmth.