One simply has to hold this position for as long as they can while making sure the core is tight and the body is straight from neck to heel like a wooden plank, not bending anywhere. This strengthens your core, increases muscle definition, heightens metabolism, reduces back pain, gives you a better posture and much more.
For starters, try holding this position for 3 sets at 60 seconds hold each and keep a goal of 2 minutes for 3 sets.