Most oenophiles passively enjoy the unintended health consequence of their passion: that wine may help promote a healthy heart. Several Napa Valley wineries will make that connection an active one this summer by offering exclusive fitness classes in their vineyards. Domaine Carneros (707.257.0101, domainecarneros.com) is hosting personalized yoga classes for groups of 8 to 10 on the terrace of its chateau, catering to guests’ levels of experience. A post-workout flute of the house specialty—organic sparkling w…