Adho Mukho Svanasana (Downward dog Pose)
This highly energizing posture stretches hamstrings and chest and also lengthens the spine. It also provides additional blood flow to the head. One needs to start on all fours, with hands under the shoulders and knees under the hips. You need to walk a step forward and spread your fingers wide, and the palms need to be pressed to the mat. The body should be inverted as a V while pressing shoulders away from the ears. This has to be done for 3 breaths. Your feet should be hip-width apart.