Warm Up Core -- Abdominal Muscles

Lie down on the floor with bent knees. Use your abdominal muscles to keep your lower back on the floor. Place a block between your legs so that the long side is parallel to your adductors or inner thighs, and squeeze for 10 to 20 seconds, depending on your ability. Your pelvis will be in a posterior tilt: They will be up and away from the top of your thighs until your lower back is on the floor.Feel as if you are pulling your navel toward your spine. Do this at the  same time for 10 to 20 seconds, according to your ability, at least five times.

This exercise is in an article by yoga teacher trainer Jason Crandell, in the June 2012 edition of Yoga Journal, page50.

My third book, Pocket Guide to Fitness, is available on http://www.Authorhouse.com and http://www.Amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.