Researchers looked at data from more than 137,000 runners who competed in races in Tel Aviv between 2007 and 2013. During that time period, there were only two serious cardiac events, neither of which was life-threatening; there were 21 serious cases of heat stroke, two of which were fatal and 12 of which were life-threatening. Keep yourself safe this summer by learning how to prevent heatstroke and recognize its symptoms. Here’s what you need to know: How To Prevent HeatstrokeBrush up on basic information about heatstroke’s early symptoms and simple ways to avoid it. 4 Ways To Beat The Heat When Working OutOur editors share how to keep cool and stay hydrated, even on the hottest summer days. 6 Natural Ways To Stay Cool This SummerAC alternatives to cool you off and cut your energy bills