Who says they’re just for kids? Give yourself permission to let loose and play in the white stuff, it can actually give your immune system a boost. Laughter stimulates the activity of natural killer cells, which fight cancerous cells and may prevent the flu, according to an article published in Evidence-Based Complementary and Alternative Medicine. So go ahead: pull on those snow pants, zip up your coat, and have yourself some frozen fun.
Source: Prevention magazine December 2012