Asanas

The best way to open the heart chakra is to open our hearts to love. If we release fear and judgement, and we learn to love and accept those around us and ourselves, the chakra will open and we will feel much healthier and stronger. However, there are several different asanas, or yoga poses, we can do to help further open this chakra.

http://www.yogajournal.com/poses/689

An example is Gomukhasana, or Cow Face Pose. Gomukhasana is a sitting pose that can be achieved by sitting in Dandasana, Staff Pose, to begin. Then you want to bend your knees so your feet are on the ground. The next step would be to lay your legs flat on the ground so that they are still bent, but parallel to the ground. Then you would cross your right knee over your left with the knees in line. To achieve the arm position, you would reach your right arm straight out and rotate it towards the front of the room until your palm faces the ceiling. Then you would lift your arm straight up then lower your forearm into the space between your shoulder blades, parallel to the sides of the waist. With your left arm, you would reach it behind your back until you can grasp the fingers of your right arm. You should remain in this pose for about a minute before switching to the other side. This pose is a heart opener because the arms are stretching backwards as the chest pushes forward. 

http://www.yogajournal.com/poses/785

Another yoga pose that helps to open up Anahata is Garudasana or Eagle Pose, which is a standing pose. This pose starts in Tadasana. Then you want to bend your knees and lift your left left, crossing it over your right, which is balancing on the ground. Your left foot should snake around your right calf so your toes are visible from the front of your body. Next, for the arms, you want to reach your arms straight out and allow your shoulder blades to spread out as far as possible in your back. Then you want to bend your elbows and lift your right one onto your left elbow with your arms parallel to the sides of your waist. Your right hand should be in a higher elevation than your left. The palms of both hands should be pressing towards each other as you lift both elbows towards the ceiling. Remain in this position anywhere from 15 to 30 seconds, then release your arms and legs, stand in Tadasana, and repeat on the other side. This pose is heart opener because it stretches the shoulders. 

http://www.yogajournal.com/poses/688

Ustrasana, Camel Pose, is a chest opener as well. To maneuver into this pose, start in a kneeling position, with your thighs perpendicular to the floor and your calves parallel to the sides of the (yoga) mat with the tops of the feet touching the top of the mat. Next you want to press your shins and tops of your feet firmly into the earth and imagine raising your sitting bones further up your back. Then you would place your hands at the base of your back with your finger tips reaching towards the ground to lengthen your lower back. To go into the full posture, lean back and reach your hands to the bottoms of your feet and hold for up to a minute. The thighs should be active and remain perpendicular to the ground. The head can drop back a bit, but the chest should remain lifted without the hips puffing forward. The shoulder blades should be down and into the spine. This pose is a heart opener, obviously, because by reaching your arms backwards with your chest up, you are stretching and opening the heart. 


Source: 
http://www.yogajournal.com/basics/898?page=5
http://www.yogajournal.com/poses/689
http://www.yogajournal.com/poses/785
http://www.yogajournal.com/poses/688