When it comes to pre-workout snacks, you need to make sure you are getting healthy carbs. Sugars will only leave you with a temporary high energy that will send you crashing hard when it wears off. Oats are a great option for a healthy carb. While they are high in fiber and carbs, they are also loaded with protein and good fat. Oats are also full of important vitamins, minerals and antioxidant plant compounds.