You will want to read this research on the tragedy of sudden workout deaths. http://curezone.com/art/read.asp?ID=33&db=8&C0=16

Make sure your multi-mineral supplement contains enough magnesium, or, probably even better, just make sure that your summer diet includes at least one leafy green salad a day.  Kids might enjoy a spinach salad or even an omelette stuffed with spinach and turkey bacon.  "I know it’s green, but close your eyes and taste!"