Groupon always saves you money, usually at least half off. But this weekend, Friday, March 21, through Sunday, March 23, get an extra 20% off one health and fitness deal. Use the promo code ACTIVE20. The maximum you can save is $50. Eligible deals include gyms, races, rock-climbing, dental treatment, eyeglasses, tennis lessons, weight loss programs and much more. Browse the full list of health and fitness deals here.