heat stroke

A person with a high aerobic fitness level can handle activity in the heat much better than someone who is out of shape.
Between 1960 and 2009, 123 high school football players died from heat-related illness. A new study suggests the risks are highest for linemen.
As either a trainer or trainee, you need to be prepared to deal with any unexpected life-threatening situation that can occur during a training session or athletic competition.
Does extreme off-season training in football serve a purpose? Or does it just put athletes at risk with no contribution to better performance during the season?