Kukkudasana strengthens the wrists and the abdominal muscles.

How to do Kukkudasana?

• Sit in the Padmasana posture - that is, with your legs crossed and soles facing upward close to the navel. Inhale deeply.
• Place your hands between your thighs and your calves and place your hands downward.
• Push through till your palms are resting on the floor.
• Keep your palms beside one another, thumbs touching each other. 
• Exhale. Lift your body off the ground slowly. 
• Balance the weight of your body on your palms. 
• Ensure that you are breathing evenly to better maintain balance.
• Remain in the posture for as long as you can.