For practicing this exercise, make sure you are sitting on the floor, your knees are bent and your feet flat on the ground, now begin the exercise by shifting your upper body weight back towards your coccyx  (tailbone), at the same time, lifting your legs off the floor to make a V shape of yourself, bring both of your hands at the level of each of the knee joint, now, keep straightening and bending your knees.  (Hold the straightening position for up to 50 seconds and then bend again). Repeat the exercise 3 to 4 times.

Benefits: The exercise strengthens deep abdominal muscles, helps in increasing the length of the spine, and widens the chest.