Dry heaves have been associated with training that goes into the anaerobic (without oxygen) realm. If you feel dry heaves coming on at the end of your interval or race, slow down but keep moving. Don't stop. The movement will help keep your heart pumping, the blood flowing, and flush out some of the lactic acid buildup. Slowing down at the end of your workout also helps your body adapt to a more static state. A proper cool-down is always in order—good for the muscles, the body, and the soul. After that, you can hydrate and jump into the shower.