Barbell Horizontal Knee Tucks

Place barbells in your hands and extend your arms out to your sides. Lift your feet from the floor and attempt to lie on your back with your legs fully extended. Pull your knees toward your chest and sweep your arms toward your feet. Return to the extended position and repeat for 30-45 seconds. Move slowly at first until you can coordinate the movement.

Variations:

Raise one knee at a time instead of both knees.
Hug your knees with your arms before returning to the extended position.
Pause in the tuck postion for 3-5 seconds.
Hug your knees with your arms and flex/extend your feet.