Barbell Rollout

Load a pair of 5-lb. plates on to a barbell.  
 
Kneel on an exercise mat or towel with your shoulders directly over the bar.
 
Grab the bar with an over-hand, shoulder-width grip and put your butt in the air. Keeping your arms straight, roll out forward, keeping your abdominal muscles contracted. Pasue at the full extension position. Using your abdominal muscles, pull yourself back to the starting position.