Laying on the floor belly-down, have arms beside your hips
Activate core by drawing in belly button towards spine and squeezing gluts.
With core and butt squeezed, lift chest off the floor, lift arms up and back towards the hips rotating thumbs towards the ceiling.
Pause momentarily at the top of the lift then return to starting position; at all times keeping the chin tucked into the chest.
Upon completion of the movement, repeat.
Don't over emphasize arching of the back to lift the chest off the floor. Only lift to where is comfortable-no lower back pain should be felt.Try to breathe in as you lift and exhale as you lower to the floor.