Waltz your way to health in Viennese 3/4 time. There are two kinds of waltz, American and Viennese. American, the slower of the two, is “great for toning and strengthening muscles.” But for a real aerobic workout, Viennese style will challenge most athletes with 56 to 61 bars per minute and a step for every beat, faster than the jitterbug. There’s scientific research backing up the dance studio owners’ claims of health benefits: 110 heart-failure patients who waltzed three times a week for eight weeks demonstrated comparable cardiopulmonary function to others who rode a bike or walked on a treadmill.