Absolutely, exercise can indeed boost energy. When you engage in physical activity, you increase the amount of epinephrine, also known as adrenaline, released from a brain structure called the locus coeruleus. This wakes up the brain and gives you more energy. It's scientifically proven that being in action increases levels of epinephrine. This is why exercising early in the day can give you more energy for the rest of the day.
However, it's important to note that if you're getting up extra early or drinking caffeine too close to waking, you might still experience a bit of an afternoon crash. To avoid this, try pushing your caffeine intake out about 90 to 120 minutes after waking. This will help increase your epinephrine levels and give you more energy throughout the day.