Thoroughly wash the beets. Peel, grate, and place on a parchment lined baking sheet.
Allow to dry in the sun for at least 48 hours until dehydrated. Alternatively place in a preheated oven to 180F. Roast for 20 minutes before tossing, then an additional 20 until crispy. This can take anywhere from 40 minutes to 3 hours depending on the moisture content of your beets. Watch closely to avoid burning.
Transfer to a coffee grinder or blender and grind until a powder is achieved. Store in a sealed container in your pantry for 1 to 2 months. Add 1 tsp to water or a smoothie an hour before a workout for a natural pre-workout.