During a failed attempt to discover gravity, Sir Isaac Newton fell face first into a snow bank while carrying a heap of delicious fruit—inadvertently discovering the health benefits of mixing squashed nutritious food with sub-Arctic cold. Today’s Groupon lets you replicate Newton's experiment under controlled conditions: for $8, you get two vitamin-packed medium smoothies at Smoothie King (a $16 average value after tax, depending on the smoothies). Choose from 18 participating Smoothie King locations.

Smoothie King smoothies combine fresh fruit, natural juices, and special nutritional enhancers into more than 90 flavors (you can customize, add, and subtract the extras) of icy delight, all of which focus on achieving one of seven nutritional goals. Try an antioxidant-rich Pomegranate Punch with pomegranate, bananas, blueberries, apple juice, soy protein, and Turbinado sweetener to stay healthy. Weight-conscious en-smuthiasts can trim down and float away with the Celestial Cherry High, packed with bananas, black cherry, papaya, Turbinado, and honey, and unpacked with fat. You can also customize any smoothie by adding enhancers or “make it skinny” by cutting out the honey and Turbinado.

All that choice stems from Smoothie King’s founders, Steve and Cindy Kuhnau, and their decades of experience. Seeking a delicious way to alleviate his allergies and low blood sugar in the late 1960s, the male Kuhnau tried blending fruit, nutrients, and proteins at home, creating the smoothie. In 1973, he opened his first health store with the first official smoothie of Smoothie King. Smoothie King remains committed to tasty health solutions, complementing its smoothie selection with snacks and supplements along with advice for good health. You can buy multiple Groupons as gifts, so treat your friends to some tasty, frozen medicine and start an epidemic of feelin’ good.

Reviews

Yelpers give Smoothie Kings in the DC area a three-star average:

• A piece of heaven. Really. There are numerous choices you want, and also they have heaps of different kinds of powders - protein, vitamins, etc... Delicious. I had mangofest, pina colada island, and raspberries sunrise. I would go back again and again just to drink the smoothies. – Billy K., Bethesda Smoothie King, Yelp
• i normally HATE smoothies, but island impact makes me love them! I've become such a fan I got the "frequent smoothie drinker" card! woohoo! – Anne C., Arlington Smoothie King, Yelp