While fueling with a pre-workout high performance energy bar is one way to energize your workout, you could less expensively consume 250 calories of Fig Newtons or a granola bar. All will offer the “magical” energy source that muscles need for a high-energy workout: carbohydrate! Lean endurance take;

• The best pre-exercise snacks are foods that digest easily and do not talk back to you.

• Standard supermarket foods can do that as well as engineered products.

• The main role of carbohydrates is to provide energy. When they are digested, carbohydrates are broken down into glucose to provide readily available energy for the body to use quickly and effectively.

• Carbohydrates are the most important form of fuel for exercise and sports activities.

• Energy: Carbohydrates are the main source of
  energy for our brains and bodies to function
  properly.

• When carbs are eaten they are eventually
  digested and broken down into smaller sugar
  molecules called glucose. These glucose
  molecules are stored in the liver and muscles to be used for fuel, especially during physical activity.

• Carbohydrates improve athletic performance by delaying fatigue and allowing an athlete to compete at higher levels for longer.