It is that time of year, high school football players say goodbye to their summer and begin two-a-day practice for their upcoming season. As much as I enjoyed playing football, I never enjoyed losing the last couple weeks of summer vacation. Really hated wearing full equipment and practicing in 90 degree temps.

Every year, a football player -- pro or youth -- is overcome by the heat. If you have kids playing summer sports, doctors

are taking a closer look at what is -- and isn't -- appropriate for hot weather exercise.