Regular exercise will help to improve your energy levels long term, but a workout can give you a short-term hit of energy, too. Working out increases your heart rate and body temperature, and it releases endorphins, dopamine, and serotonin for a feel-good boost. Hit the gym, go for a run, or even get up from your desk to do a few jumping jacks. Try exercising outside, too. You’ll get fresh air and sunlight to wake you up further. Expert tip for more energy: Exercise during the day can help you fall asleep at night, but be sure to avoid intense workouts within an hour of bedtime.