Passengers on JetBlue, a low-fare US domestic airline, are getting a free lesson in stress management. The airline has introduced instruction cards produced by Crunch Fitness that depict four different yoga postures to unkink muscles and increase circulation. The yoga exercises include Bidalasana, which entails hunching over in your seat (sort of like you need the barf bag), and Uttita Hastasana, where you interlace your fingers and stretch up towards the air duct while relaxing your face, jaw and eyes. "We want passengers to feel better, be relaxed and take a little stress off for a while," says JetBlue's marketing vice-president, Amy Curtis. "If you don't feel like watching TV, have a little stretch and chill out."