Plank is a great way to strengthen and tone your core. It also strengthens the wrists, arms and spine. Plank helps lay the groundwork for more challenging arm balances and is also a key pose in Sun Salutations.
Start in Adho Mukha Svanasana, or Downward Dog. Inhale, shift the weight forward until the shoulders are directly over the wrists and the torso is parallel to the floor. Spread your fingers wide. Firm the bases of your index fingers into the floor. Essentially press the earth away. Broaden the shoulder blades. Lengthen the crown of the head forward and the tailbone toward the heels. Align the body in a straight line from the top of your head to your heels. Hold the posture for 30 seconds to one minute. For a more advanced variation try lifting one leg at a time. Avoid Plank if you are suffering from Carpal tunnel syndrome.