polar bear swimming

Photo: Thinkstock

2 of 3
The Polar Bear Club
A study in Clinical Physiology found that healthy, habitual winter swimmers who jumped from saunas into frigid water had improved immune function compared with those who don't regularly swim in the cold. Researchers believe that over time, exposure to extreme temperature differences may boost the production of infection-fighting cells.
PREVIOUS | NEXT

NEXT STORY

Comment

LONG FORM
ONE WORD