By now, all understand the importance of fueling up before an intense sweat session, whether it's one of these 10 high-intensity workouts for weight loss or one of these 25 brutal workout finishers for rapid fat loss and muscle-building.

What you may not know is that you could be sabotaging your workout with the wrong foods.

Here are five foods you want to avoid eating before working out at all costs. And make sure to check out five of the best pre-workout foods that'll set you up to demolish even the most grueling of workouts.