How to Perform a bird dog extension

First of all sit on your knees on the floor. Now place your palms on the floor facing downwards. Now position yourself such that you are resting on the floor on your palms and your knees. Now lift up your right hand and at the same time you have to lift your left leg. Position them in line with your body. Hold for a few seconds. Now bring your right hand and your left leg down. Repeat it for the other hand and leg as well. Keep repeating this exercise for sometime. This exercise helps you in building the back muscles. There is no need of any equipment for this exercise. That's it.