MORE: 20 Super-Healthy Smoothie Recipes “After a sweaty half-hour workout in the heat, you need to replace, on average, 600 to 750 mg of potassium and about 250 mg of sodium—roughly the amount in ten 1-ounce cubes,” says Christine Gerbstadt, a registered dietitian. Opt for an unsweetened variety and, at only 5 calories a cube, it’s a smart smoothie add-on that won’t undo your hard work. Cheers! MORE: 9 Ridiculously Healthy Smoothie Add-Ins
