Kukkutasana Or the Cock Pose
A cock is called kukkut in Sanskrit, hence the name.
Method: Sit in Padmasana. Now insert your hands between the opening in your calves and thighs. Then push the hands further and keep your palms firmly planted on the floor with your fingers fully spread. Push your thighs and legs up your arms, using your arms as the fulcrum of exerting the force to lift your body up. Try to keep your torso as upright as possible. Breathe normally. Do it at least for a minute.
As could be seen from the illustration, this posture puts enough pressure on your chest and shoulder muscles to make them firm. The females will have their firm breast line if they do this exercise regularly.