Join Date: Jun 2008
Bikes: Devinci Millenium, Gary Fisher Joshua
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The video is long and it is # 1 of 2 and he has other videos so you have to be dedicated to watch it, but to answer your question... he explains why it is important to be exposed to sunlight (on your skin) in order that Vitamin D is produced which is important in the absorption of calcium. Also the need to avoid the strong UV at midday.