I do some yoga on daily basis, and I highly recommend it. There are so many different kinds of yoga, and also for new beginners - so there is no excuse not to try it on :)
the Cobra is one of my favourite positions, perfect start in the morning.
When performing the Cobra Pose, the head and the trunk gracefully arch up. The spine stretches powerfully and the abdominal organs together with the surrounding musculature receive a thorough massage. This pose is recommended to relieve pain and constipation, as well as for treating menstrual irregularities.
In order to proceed with the exercise keep your shoulders down and your face relaxed and your elbows tucked to your body, lying on your stomach with your legs together. It is recommended to place your palms under your shoulders and to rest your forehead on the floor.
While inhaling, slowly move your head up, then lift your hands and use your back muscles to raise your chest as high as possible. After holding your breath for a few moments, exhale, slowly returning to the starting position.
While inhaling, gradually raise your head and shoulders to the previous position, only this time use your hands to push your trunk up. Push your body upwards until you are bending from the middle of your spine. Try to hold in that position for as long as two or three breaths and then exhaling, slowly come down.
Raise the trunk as before, inhaling deeply. However, try this time to bend your back until you feel it bending from the neck to the base of our spine. Hold the position for as long as you feel comfortable. Breathing normally, slowly return down to the initial position and relax.