Beginning on all fours, walk your hands out until your palms are directly under your shoulders, then walk your feet out until your body forms a "plank" position (pictured below) or what is recognized as the beginning of a push up.
|Picture 1/Full Plank position|
|Picture 2/Yoga Ball Plank position|
|Picture 3/ Forearm Plank|
|Picture 4/ Knees bent hovering over floor|
|Picture 3/Forearm Plank|
|Picture 6/ Leg Raise|