"To say the positions of yoga are no more than exercise are tantamount to saying water baptism is just aqua aerobics," Lindel. Wearers can choose one of 30 different activities, including yoga, volleyball, rowing. So while things like 20-day battery life and automatic exercise tracking are features that could draw customer. Inside a spacious exercise studio in Falls Church, Virginia, instructor Susan Lowery leads eight students through a series of…