Some days you need a little extra something-something to hit the gym and hit it with intensity.

What is pre-workout, exactly?

However, therearecaffeine-free pre-workout formulas, typically marketed as non-stim pre-workouts.

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These versions wont give the same jolt of energy as one that contains a caffeine derivative (duh).

Want to try a pre-workout before your next gym sess?

Scientifically speaking, calories are energy units that the body uses like a car uses gasoline, explains Matheny.

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registered dietician and CEO of supplement and snack company Promix

Calories, of course, come from the carbohydrates, protein, and fats in food.

So… are pre-workout supplements enough?

Most pre-workout supplements are no- or low-calorie, says Matheny.

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That might be useful for morning movers experimenting withfasted cardio.

But everyone else will need to pair their pre-workout mix with some good ole fashion real food.

Many people who are feeling flat in the middle of their workout routines are just dehydrated, he says.

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And dont forget bedtime: You also want to confirm youre sleeping enough, Matheny adds.

As Matheny puts it, Its always best to cover the basics before adding in supplements.

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registered dietician and CEO of supplement and snack company Promix

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