When working out, dietitians say that your activity level should determine how you are replenishing.

Registered dietitian Kelsey Herrick said when people work out, they sweat and lose electrolytes, which could leave someone feeling tired and worn out. 

To prevent dehydration, Herrick recommends water if your workout lasts less than an hour. Sports drinks like Gatorade are important for different kinds of workouts.

"I would encourage people to have a sports drink for anything that is intense or anything lasting over an hour for your exercise," said Herrick.

Herrick said if you still feel sluggish and fatigued while working out, changing eating patterns before exercising could help.

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