Quote:
Originally posted by kilty
Exercising right after you get up. Very dangerous. There are reports of heart attacks due to this because you are comming from a sleep state (comma) and then jump starting your heart rate way up. Careful! Start by drinking a full glass of water right after you wake up, it will hydrate you and will give you some time to wake to normal heart rate. Again drink to chuck a glass of water. Should take you about 10 minutes to finish the glass.
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the problem with exercising right after waking up actually has to do with tissue temperature. you're body temp. drops by a few degrees as you sleep, so if you exercise right when you wake up your exercising cold. it's not really unhealthy/unsafe if you take a slower longer warm-up period, and don't work at as high of an intensity as you might after you've been up a long time.