Football players are at increased risk of dehydration, in part because of their equipment needs. Football gear is designed for protection, but the necessary padding does not allow for quick evaporation or cooling. Experts say it's not uncommon for players to lose anywhere between 5-15 pounds during a game or workout, especially during two-a-day practices.

"It's basically like going through boot camp," said high school quarterback Cody Hill.

High school football practice is tough enough. Under the late summer sun, it's downright brutal.

"Especially with all the gear, it is extremely hot out here," Hill said.

"With the pads sitting on you, it's watery and sweaty stuff. Your body heats up pretty good," said running back Christian Boley.

The best defense is drinking lots of water.

"Technically, they should be getting about ten ounces of water every ten to 20 minutes, so that means frequent breaks," said athletic trainer Jason Wentworth.

Wentworth recommends kids load up on water or sports drinks before and after practice.

"Drink beyond thirst. If you're thirsty, you're already dehydrated. Stay away from all the fancy energy drinks that are out in every vending machine in every store. Stay away from caffeine, which dehydrates you," Wentworth said.

Dehydration can be hard to recognize. That's why Wentworth said coaches and parents need to make sure their kids are drinking enough water.

"I'm losing a lot, but I'm putting in a lot, both during and after practice too, so it balances out,” Boley said.

These players say staying hydrated helps their performance. On this field, they can use all the help they can get.

"It's pretty brutal, especially when you go through conditioning and everything. After conditioning, you're just dying and you need some water," Hill said.