This fruit provides healthy doses of fat that an active body will utilize as fuel to power through a grueling day or workout. It's also rich in vitamin C, fiber, vitamin K, folic acid and B6. Vitamin C acts as an antioxidant and can support the adrenal glands, which can be overworked during times of stress. While B vitamins are responsible for many functions in body, they are most often thought of as the 'stress and energy' vitamins. Your body goes through a lot of stress during a workout, so this is kind of the magic fruit. Before your work out, have half an avocado mashed with some lemon juice and sea salt.