Food & DrinkFitness 25 Food to Eat Prior to Workout By lase - April 28, 2018 Advertisements 22. Whole-Grain Avocado Toast – The Dream Snack for Millennials. Photo by Trang Doan from Pexels Whole-grains are the best fuel before a tough cardio session. They help you to increase your endurance, plus the avocado is great to kick-start your fatty acid metabolism. Advertisements