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The video explains about the two legged lift with the stability ball which aims at stabilizing the upper body and increasing the strength of the lower body. To begin with, you can place your body on the stability ball with your face towards the ground and roll over it towards the front. Here you can support your body with your hands and adjust accordingly to find the right balance.
Then you need to lift your legs so that your head, spine and legs are in a parallel position with the ball and your hands taking care of the balance. Here, you need to lift your legs up and down from the hips in order to achieve the best result for your body you need to ensure that you concentrate on each part of the body while working out.
One precaution that you have to take is that the toes need to be pointed all the time so that you can gain maximum stretch. Also your stretches will vary as per the flexibility of your body.