Start by sitting on the ground with hands planted next to hips,
Drop hips down to directly below shoulders, but staying about
legs extended and heels on a towel.
2 inches off ground – this is L-sit position. Hold for a second then drive hips up to the posterior plank position.
While keeping heels on the ground and hands below shoulders, drive hips to the ceiling to draw a straight line from head to heels – this is the posterior plank position.