✔️ Beets boosts exercise performance. Athletes in particular, listen up! Because of the high concentration of nitrates, beet juice can also have a positive effect on your body during exercise, by boosting your stamina to help you exercise for longer. The body’s conversion of nitrates intro nitric acid is an extremely important tool for the heart muscle. The blood vessels expand through the absorption of nitric acid, which consequently leads to a better blood flow, and a better absorption of oxygen.