Yoga Mudra -- Sit in the lotus position, Breath in and out slowly. Exhale and bend down. Try to touch the ground with your forehead. You hands should be behind your back.
Benefits -- Helps increase concentration power

Sarvangasana - Lie flat on your back and inhale deeply while raising your legs and spine until the toes point to the ceiling. The body rests on the shoulders and the back of the neck. The body is supported by the hand, which are places on the center of the spine between the waist and the shoulder blades. Keep your legs and spine straight.
Benefits -- Increases blood flow and reduces stress.

Ardha Matsyendrasana -- Sit with your legs spread out in front of you and keep them together. Bend your left leg and pull it below your right one. Raise and bend your left leg and place the foot of your left leg outside the right leg. Keeping the elbow on the outside of your leg. Bend your left hand behind your back. Sit in this position for as long as you can.
Benefits -- Keeps your body toned

Surya Namaskar -- Stand on the edge of your mat in a prayer pose. Then raise both your hands backwards. Bend down and slowly hold both your foot. Push your right leg back and bring the right knee to the floor. As your breath in bring your whole body in a straight line. Slightly take your hips back, slide forward and rest your chest and chin on the floor. Slide backwards and raise your chest upwards. Breathe out and lift your hips and tailbone upward. Bring your right foot ahead and left foot behind. Bend down and slowly hold both your foot. Raise both your hands backwards. Come to your starting position.
Benefits -- Good exercise for all the parts of your body.

To know more of how to perform and what are the benefits of these asanas please watch this video.