Start by lying on your back with your knees bent as close to your butt as you possibly can, then grab your ankles and start slowly and carefully rise your butt to the air and stop at the point in which you feel a stretch, not rise your abs little higher and stop at this position for 3-7 seconds and start going back to the original position slowly, repeat it for 3-5 times, that is advanced stretch and you may not succeed at first, but keep on trying.

Some More Great Stretches:

Straight Leg up, Wall Stretch, Hands on the Head Bow Dow, The Super Stretch, The Hanging Stretch, The Down Hill, Two Straight Legs up, Touch Toes, Cat Stretch, The Yawn, The Bow Down, The Table Stretch, The Bridge Stretch, Basic Leg Stretch, Super Cobra Stretch.