Bananas are great for a pre-workout snack. If I work out in the morning, I eat a small to medium sized banana, because almost always, I am STARVING by the middle of my workout, which is never good. The banana seems to be just the right amount to curb my hunger and not kill my calorie goals for the day.
And look! I found this article from Men's Fitness, which endorses bananas as an ideal pre-workout snack, among others: www.mensfitness.com/nutrition/what-to-eat/