HOW: Start on your knees and forearms with your forearms supported on a towel on a surface with minimal friction. Place something under your knees like a pad or pillow for support. Begin the exercise by sliding your forearms forward to perform an ab roll out, lower yourself down as far as you feel comfortable with, then return to starting position and repeat.
FEEL: This should feel like an upper body and core workout.
COMPENSATION: Do not let your low back excessively arch or bend. Stay strong through your shoulder blades, don't let your chest sag to the ground.