Lie on the ground, facing up, with a sturdy object near your head, which you grip with both hands.
Open your legs wide (the wider, the easier). Keep them on the same plane as your torso for the whole duration of the exercise (do not bend at the hips).
Engage your Abs , pull on your hands and hinge at the shoulders to lift your whole body straight up, until your hips are above your shoulders (or nearly).
Then lower yourself back down with control and repeat.
Form tips
Keep your Abs engaged at all times and a slightly Hollow body .