by Zhou He » Sun Nov 01, 2009 9:39 am
I asked Wudang Daoist Zhou Xuan Yun a similar question.
Here is his answer
Xuan Yun says it's important to be scientific about your practice. He says for winter you have to be careful to not let the cold invade your body while practicing standing meditation outside. He says you should find a sunny place, and practice during the warmer parts of the day. He also says if you are limited to practicing before the sun is up, or after it goes down, you should practice inside. If you feel cold, he recommends bundling up until you feel comfortable again. There are qigong practices that teach you to raise or lower your body temperature, but they take years of practice, and are usually used for emergency situations only (or for showing off) since they waste a lot of vital energy.
Check out Daoist Gate and buy Xuan Yun new DVD! Im expecting mine in the mail anytime soon ^^