“When Rabbi Andrea London began the morning blessing, everyone assumed the lotus position, with backs straight, legs crossed and ankles on thighs as wisps of incense smoke wafted through the air. As the service progressed, each yoga posture became more aerobically intense than its predecessor. For the Shema prayer, the 15 or so congregants in attendance — mostly middle-aged women — each swung out a leg and stretched their arms around their bodies while chanting the most traditional Hebrew prayer in the most untraditional way.”